Abstract
This review aims to cover a wide array of minimally invasive musculoskeletal procedures developed to address several articular and periarticular conditions locally. Besides details related to ultrasound guidance, in part 1, we will review barbotage, botulinum toxin, corticosteroids, dry needling, gene therapy, hyaluronic acid, hydrodissection and mesenchymal stem cells. In part II, we will cover nerve blocks, ozonetherapy, platelet-rich plasma and derivatives, prolotherapy, radiopharmaceuticals, sclerotherapy, thermal ablation and intratissue percutaneous electrolysis. A review of guidelines covering these issues will also be presented.
Introduction
Rheumatic musculoskeletal diseases (RMD) present significant and persistent challenges to healthcare providers. These conditions can profoundly affect patients’ well-being, functional capacity, and overall quality of life. Furthermore, RMDs often impose a considerable burden on families and society at large, with wide-reaching socio-economic implications and potential consequences for mental health.
There is a growing array of local techniques, specifically minimally invasive musculoskeletal procedures (MIMSP), most of them being ultrasound-guided, developed to address articular and soft tissue manifestations of rheumatic diseases. These interventions are expanding the therapeutic landscape yet simultaneously challenging the existing knowledge and skillset of rheumatologists.
The administration of drugs or autologous products directly into articular or soft tissue sites offers distinct advantages compared to systemic delivery. These include reduced systemic exposure and associated adverse effects, enhanced local bioavailability and, in some cases, lower overall costs. Despite these benefits, the effectiveness of certain intra-articular and soft tissue therapies remains a subject of debate. This uncertainty stems from limited data, methodological shortcomings, study heterogeneity, and a scarcity of high-quality evidence. Additionally, outcomes as reported by patients, such as pain relief and reduction in stiffness, are particularly susceptible to placebo effects, a phenomenon that is especially prominent with injectable treatments.
Conducting rigorous investigations into these therapies is essential, particularly as the demand for effective management strategies continues to rise. Such approaches must be tailored to the unique needs of individual patients, ensuring that treatment remains both patient-centered and clinically relevant.
This review aims to cover the main types of MIMSP in rheumatology, to understand their indications, limitations, and potential, to identify their main adverse events, and to assess the current evidence-based efficacy of MIMSP (–). This review emphasizes ultrasound-guided procedures and excludes synovial and muscle biopsies, which are covered elsewhere (, ). After the Ultrasound Guidance section, the remaining techniques are depicted in alphabetical order.
Methods
A literature search was conducted using PubMed and Google Scholar as web search engines. Included key words were “minimally invasive musculoskeletal procedures,” “ultrasound guidance” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “barbotage,” “percutaneous lavage,” “botulinum toxin” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “corticosteroids” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “steroids” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “glucocorticoids” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “dry needling” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “fenestration” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “percutaneous tenotomy,” “gene therapy “AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “hyaluronic acid” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “viscosupplementation,” “hydrodissection” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” “brisement,” “mesenchymal stem cells” AND “musculoskeletal local injection,” OR “musculoskeletal injection,” and “mesenchymal stromal cells” AND “musculoskeletal local injection “OR “musculoskeletal injection.” No a priori exclusions were made concerning study design, publication date, or language. The only inscribed restriction was that the search should be limited to human studies. The search produced 2,584 results, of which 2,412 were excluded due to duplications, non-human studies, procedures for non-musculoskeletal applications, or for tumor pathologies. Finally, 172 publications were analyzed, aiming to retrieve information that could be useful for this review.
Ultrasound Guidance
Before any MIMSP, it is advisable to perform an ultrasound (US) to identify the target and its relationship with the surrounding structures. Additionally, an evaluation with color/power Doppler may be useful to identify vessels that need to be avoided in the nearby area.
We know that quite often US changes the decision to inject and where to inject, and that blind procedures are problematic in small or deep-seated targets. On the other hand, US guidance of MIMSP optimizes fluid detection and aspirated volume, increases efficacy and tolerance of local injectates, reduces adverse events, and is more cost-effective than landmark or fluoroscopic-guided procedures (, –). This is why MIMSP under US guidance are particularly indicated when non-guided procedures have failed. However, US-guided MIMSP may be more resource-consuming, require additional preparation and training, and in some situations may produce outcomes not meaningfully different from landmark-guided procedures (, ). Other advantages of US-guided MIMSP over fluoroscopic guidance, being both techniques available with similar operator expertise, relate to the absence of radiation, the better visualization of soft tissues, and the lower resource consumption with US-guided MIMSP (). Resource consumption, costs, availability, or radiation are all issues that compare US favorably with CT, MRI, or fusion images with US, in guiding procedures at the peripheral skeleton.
US-guided MIMSP may be conducted in two ways—by marking on the skin (semi-guided or indirect), or under direct vision. This one may be performed with free hands or using a guiding device according to the probe’s long or short axis (). With the indirect option, we use US to depict the target. Then we mark on the skin the area where the probe is, and if we insert the needle in the center of it and penetrate according to the measured depth to the target, we will hit it (Figures 1a,b).
FIGURE 1
An easier and preferable way of conducting a US-guided MIMSP is under direct vision. In the in-plane approach, the entire needle is depicted as a hyperechogenic device as it progresses through the tissue until it reaches the target (Figure 2). When performing the in-plane approach, if the operator’s eyes are lined up with the needle shaft, the short axis of the probe, and the US machine, the accuracy of the procedure increases. This is why the most common and preferred modality of US-guided MIMSP is an in-plane free-hand technique, under real-time direct vision.
FIGURE 2
In the out-of-plane approach, the needle is depicted as a hyperechogenic dot, but only in the moment it intersects the US plane (Figure 3). The major disadvantage in the out-of-plane approach is that the location of the needle tip cannot always be determined.
FIGURE 3
Careful pre-procedure planning is the most crucial step in successfully performing an ultrasound-guided procedure. Before any US-guided MIMSP, there are a few steps that need to be undertaken, namely ():
patient reception and information
exclusion of contraindications to conducting the procedure
obtaining written informed consent
brief ultrasound examination to plan the most adequate needle path
asepsis and field preparation
fluid aspiration when present
local anesthetic when adequate
the procedure itself
Any US-guided MIMSP must be conducted by qualified operators, with adequate assistance from technical personnel and under adequate aseptic conditions (, ).
US-guided MIMSP may be conducted for diagnostic or therapeutic purposes:
Diagnostic
fluid aspiration
biopsies
synovial—joints, bursae, tendon sheaths
muscle
Therapeutic
local injections
other percutaneous needle therapies
We need to choose needles according to the size and depth of our targets. In Figure 4, we show examples of this.
FIGURE 4
Besides synovial fluid, aspirated fluid may also be blood or pus. In every case, its content may be used for biochemical or microbiologic analysis and for cell count, and in the case of synovial fluid, also to search for crystals in the polarized-light microscope ().
Aspirating fluid may be therapeutic by itself, by removing deleterious cytokines and enzymes, or through structure decompression, and may be conducted for research purposes as well.
Indications for joint and periarticular injections include (, , –):
Joint injection
synovitis
osteoarthritis
Periarticular injection
tendinosis, tenosynovitis
bursitis and synovial cysts
fasciitis
entrapment neuropathies and neuromas
joint analgesia in severe arthropathies with no indication for joint injection or surgery
Contraindications for MIMSP include skin or systemic infection, coagulation disorder or anticoagulant therapy that might represent an increased risk for bleeding, the uncooperative patient, and allergy to any of the drugs used ().
General adverse events (AE) of local injections may be occasional, uncommon, or rare (, ):
Occasional
vasovagal reaction
- •
Uncommon
aseptic synovitis
allergy to the compound
ecchymosis/hematoma
nerve lesion
- •
Rare
skin fistula
osteonecrosis
iatrogenic infection
tendon rupture
The most frequently injected joints are knees, shoulders, wrists, and finger joints, and the most used injectables are corticosteroids, followed by hyaluronic acid (). Concerning intra-articular therapies, the frequency of AE is low, without clear differences between injectables ().
Recommending patients to avoid overuse of the injected region, for up to 48 h, may optimize therapeutic results and minimize product linkage, access to vessels, and systemic diffusion.
The Procedures
Barbotage/percutaneous lavage
The common indication for barbotage or percutaneous lavage is calcific tendinosis of the rotator cuff. It uses a local anesthetic (LA) for tracking the needle up to the calcification and for the subacromial-subdeltoid bursa (SASDB), normal saline (NS) to “wash” the calcification (may be better if warmed up to 37–40 °C), and a corticosteroid (CS), again for injecting the SASDB (, ). The syringe that delivers the NS may preferably be of the luer-lock type to prevent spilling of the solution in case of increased injection pressure. A successful procedure is marked by the entry of a whitish fluid inside the syringe (Figure 5).
FIGURE 5
It can involve either a one-needle or a two-needle approach to break up intratendinous calcifications. The needle should be in close contact with the calcification, and in the two-needle approach, the bevels of the needles should be facing each other, with the injecting needle at the bottom and the aspirating needle on top of the calcification. The one-needle approach may be better for soft calcifications and the two-needle approach for hard ones. However, a systematic literature review showed no evidence favoring the use of a specific size or number of needles, in terms of results or safety ().
The procedure is not indicated in asymptomatic patients, if the calcification is inside a ruptured tendon, if the calcification is fragmented or smaller than 5 mm, if it has migrated to the SASD bursa, or if it is eroding the bone (–).
Specific AE of barbotage include bursitis and adhesive capsulitis.
Extracorporeal shock-wave therapy (ESWT) and barbotage (particularly if combined with corticosteroid subacromial injection) seem to be the best options to treat rotator cuff calcific tendinopathy, with long-lasting pain relief favoring barbotage over other options (–).
Botulinum Toxin
Botulinum toxin (BTX) is produced by Clostridium botulinum, with subtypes A and B approved for human usage.
Common indications for BTX injection include OA (knee, shoulder, ankle), lateral epicondylosis, muscle contractures, fasciitis, neuropathic pain (carpal tunnel syndrome, Morton’s neuroma, complex regional pain syndrome), chronic exertional compartment syndrome, low back pain and myofascial pain syndrome, in a single administration with doses ranging from 20 to 200 U, according to the underlying pathology (–). Some randomized controlled trials have shown results favoring BTX in shoulder pain (intra-articular and bursal injections), plantar fasciitis, lateral epicondylosis, and neuropathic pain (–). On the other hand, additional systematic literature reviews and meta-analyses have revealed contradictory results or did not show a clear benefit of BTX in myofascial pain syndrome, knee OA, fibromyalgia, neck pain, or piriformis syndrome, with several of these studies showing small numbers and low quality (, ). It seems reasonable that BTX may be considered in the management of some of these entities, but only when more conventional therapies have failed ().
Indications of BTX covering neurological disorders and glandular hyperactivity are also quite common but are outside the scope of this review.
The usual onset of BTX action in musculoskeletal indications varies between 1 and 3 weeks and lasts up to 6 months ().
BTX induces flaccid paralysis by causing temporary chemodenervation and affects pain neurotransmitters and the autonomic and central nervous systems. By blocking molecules like substance P, calcitonin-gene-related peptide, bradykinin, and glutamate, BTX can decrease the transmission of painful stimuli through inhibition/enhancement of ascending/descending pain pathways, but mainly it causes temporary denervation by preventing the release of acetylcholine into the neuromuscular junction, which is a mechanism of action shared by all BTX serotypes (). All these effects are mediated at the peripheral nervous system level by disrupting the transfer of pain and surface expression of receptors and by desensitization of nociceptors and blockade of neurotransmitter release. At the central nervous system level, BTX acts through effects on pain processing pathways and possibly in signaling pathways of non-neuronal/supporting cells ().
Specific AE of BTX include cramping, mild dysphagia, transient weakness, muscle atrophy, and breathing difficulties (, , , ).
Corticosteroids
CS are the most utilized injectables in rheumatology practice (). Common indications for its use include synovitis, tenosynovitis, bursitis, periarticular cysts, adhesive capsulitis, entrapment neuropathies, neuromas, fasciitis, tendinopathies, and OA (, , , , , , , ). However, considering pain relief and function improvement, CS are usually only effective in the short and mid-term, not in the long term (, ).
Several CS may be used for intra-articular or peri-articular injection, differing in their relative potency and length of action (Table 1).
TABLE 1
| Corticosteroid | Equivalent dose (mg) | Common brand names | Duration of action (h) |
|---|---|---|---|
| Hydrocortisone | 20 | Cortef, Solu-Cortef | 8–12 |
| Prednisone | 5 | Deltasone | 12–36 |
| Prednisolone | 5 | Orapred, Prelone | 12–36 |
| Triamcinolone acetonide | 4 | Kenaiog, Kenacort | 12–36 |
| Triamcinol. hexacetonide | 4 | Aristospan, Lederspan | 24–36 |
| Methylprednisolone | 4 | Depo-Medrol, Solu-Medrol | 12–36 |
| Dexamethasone | 0.75 | Decadron | 36–54 |
| Betamethasone | 0.6 | Cel estone | 36–54 |
Injectable corticosteroids: equivalencies and duration of action.
Concerning osteoarthritis, positive results have been shown for intra-articular glucocorticoid injection in the knee, hip, trapeziometacarpal, and acromioclavicular joints (–). Intra-articular CS also have a recognized benefit in rheumatoid arthritis, juvenile idiopathic arthritis and spondylarthritis (psoriatic arthritis included), notably in hand metacarpophalangeal and proximal interphalangeal joints, wrists, knees, metatarsophalangeal, ankles, shoulders and elbows, but only in the short-term, as well (–). Local CS injections are the treatment of choice for inflammatory tenosynovitis and bursitis, for trigger-finger and De Quervain’s disease (). For other tendinopathies, local CS also show positive results, but there are concerns regarding tendon damage after repeated injections, and CS are not indicated if there is a pre-existing tendon rupture or in Achilles or patellar tendinopathies, in which they do not show any benefit (). For lateral epicondylosis, CS injections produce doubtful outcomes, and their use will depend on the availability of local alternatives.
CS act by blocking the expression of proinflammatory genes, cells, cytokines, and mediators and downregulate immune function ().
Intra-articular glucocorticoid injections are overall safe, with a reported incidence of adverse events similar to placebo, mostly mild and self-limited (, , –). Overall, the most common AE are post-procedure flushing and vasovagal reaction, in up to 40 and 20% of cases, respectively, and the most common local AE is post-injection flare, which may occur in up to 25% of cases ().
Other specific short-lived systemic AE include hyperglycemia, which is frequent but only in diabetic patients, lasting 1–3 days, headache (in up to 18% of cases), increased appetite, mood changes and rarely or very rarely adrenal suppression, Tachyon syndrome (dorsal, lumbar or chest pain, associated to restlessness, nausea, skin flushing, sweating or dyspnea), or anaphylactic shock (, , ).
Other specific short-term specific local AE include tendon rupture (occurs in <1% of CS injections and is more frequent in soft tissue injections), skin hypopigmentation and atrophy/necrosis of subcutaneous tissue (in up to 7% of cases), injection site pain (in up to 6.8% of cases), relevant bleeding in patients under antithrombotic drugs (in up to 0.2% of cases) and rarely or very rarely Nicolau’s syndrome (livedoid lesions and necrotic ulcers in result of micro-emboli obstructing dermal arteries), local calcification or joint-skin fistula (, , , ).
Mid and long-term AE include chondrolysis in repeated intra-articular injections of the knee, rapidly progressive hip osteoarthritis, aseptic osteonecrosis, and Charcot-like arthropathy, which are all rare (, , –).
Septic arthritis is a feared but rare complication of intra-articular CS injection, affecting no more than 0.036% of all cases (, ). It is more common (up to 0.08% of cases) in males, advanced age, and in patients with pre-existing joint disease or comorbidities ().
Dry needling/fenestration/percutaneous tenotomy
Dry needling (DN), fenestration, or percutaneous tenotomy are different designations that are interchangeably used for a procedure in which there is penetration of a tendon or trigger-point without injecting anything. However, fenestration or percutaneous tenotomy involves gently puncturing the abnormal structure multiple times (15–25 passes), passing a needle through it manually, or using an electronic device. In the case of fenestration, beveled cutting-edge needles or an electrical scalpel are used. However, other modalities of DN exist, including the insertion of a needle once and leaving it in place, for a variable amount of time (acupuncture, if the needle penetrates an acupuncture point), or passing an electrical current through it. Percutaneous electrical nerve stimulation uses a pulsed electrical current, and the needle may be inserted inside the structure to be treated or inside acupuncture points (electroacupuncture). In percutaneous electrolysis, a continuous (not pulsed) electrical current passes through the needle. All these modalities in which the needle is left in place without fenestration use solid filament needles. This is not the case in percutaneous tenotomy, in which a beveled hollow needle is used (, 77, 78).
DN disrupts abnormal tissue, causing bleeding and releasing cytokines and other proinflammatory mediators, aiming to stimulate a local healing response through granulation tissue formation, cell proliferation, and increased matrix synthesis, leading to tendon reinforcement. Moreover, DN may reduce peripheral and central nervous system sensitization by modulating dorsal horn activity and stimulating descending inhibitory pathways (, 77, 79).
Common indications of DN include tendinopathies and enthesopathies (Achilles, patellar, hip adductor, rotator cuff, tricipital, and trochanteric tendinopathies/enthesopathies, fasciitis, and medial and lateral epicondylosis) and myofascial pain syndrome. For most of these indications, low-quality evidence points to a beneficial effect of DN. However, high-quality studies are needed to better clarify DN outcomes regarding pain and function improvement, namely not using DN combined, but compared with other treatment modalities and appropriate sham interventions, testing different DN protocols and using ultrasound-guidance (, 77–91). Considering DN modalities that use electrical currents, issues that need to be addressed relate to treatment duration, intensity of the current, and number of sessions (78).
Common and minor AE of DN include local soreness and bruising, but they are usually time-limited. Major but rare AE include infection, prolonged symptom exacerbation, permanent nerve or tendon lesion, and pneumothorax (78, 92).
DN may or may not be associated with autologous products like autologous whole blood or platelet-rich plasma. This combined approach needs further exploration because there seems to be a trend favoring the association over any of the modalities used alone (81, 88–90, 93).
Gene therapy
Gene therapy (GT) is an experimental approach that uses specific DNA or RNA sequences to modify gene expression to treat or prevent disease. In musculoskeletal disorders, intra-articular gene delivery aims to introduce complementary DNA (cDNA) or RNA so that therapeutic products can be synthesized endogenously within the joint over a sustained period. Despite this promise, GT for osteoarthritis (OA) and rheumatoid arthritis (RA) remains challenging because both are polygenic conditions without a single clear genetic target. In addition, GT is associated with high development and manufacturing costs, important safety concerns, and a limited evidence base in humans, with most data still derived from animal and preclinical studies (94–99).
Delivered genes may encode growth factors, transcription factors, anti-inflammatory cytokines, signaling molecules, matrix proteins, or receptors. In musculoskeletal disease, these strategies are being explored mainly in OA, tendinopathy, and RA (97).
A major limitation of GT is the transient expression of the gene product, regardless of the vector used. Even so, compared with recombinant protein replacement therapy, gene-based approaches can provide longer-lasting, targeted, and site-specific protein expression more physiologically. GT has also been associated with fewer immune reactions than allogenic stromal cell therapy in some settings (99, 100).
Delivery methods
Gene transfer may be performed by either a direct (in vivo) or indirect (ex vivo) approach. In direct delivery, the vector and transgene are injected locally into the joint. In indirect delivery, healthy cells are first harvested from the patient, genetically modified and expanded in culture, and then re-implanted into the affected joint by intra-articular injection or arthrotomy, with or without a scaffold. Overall, indirect (ex vivo) delivery is considered more efficient than direct delivery and safer than introducing viral vectors directly into the body (97, 101).
Injection-based delivery mainly places the therapeutic product in contact with the synovial membrane rather than directly with a chondral or osteochondral defect. For this reason, it is used primarily to deliver anti-inflammatory cytokines such as IL-10 or IL-1ra in RA or in osteoarthritic joints with full-thickness defects. In direct procedures, the vectors most commonly used are recombinant adeno-associated virus (rAAV) and self-complementary adeno-associated virus (scAAV), followed by plasmids and lentiviruses (97).
For cartilage defects, indirect procedures are used more often, with cell vehicles such as mesenchymal stroma cells (MSCs), chondrocytes, or fibroblasts. Vectors may also be incorporated into scaffolds to reduce dilution of modified cells after intra-articular injection (97).
Gene delivery vectors
Vectors used in GT may be broadly classified as non-viral or viral. Non-viral vectors are generally safer, easier to handle, less immunogenic, and potentially more cost-effective than viral vectors. However, they usually produce lower and shorter-lived transgene expression, are often limited to the synovial membrane, and have lower transfection efficiency (approximately 25-50%, compared with 70–95% for viral vectors), with poorer targeting than viral vectors (Table 2) (97, 100–102).
TABLE 2
| Feature | Non-viral vectors | Viral vectors |
|---|---|---|
| Transfection efficiency | Lower (approximately 25–50%) | Higher (approximately 70–95%) |
| Targeting | Poorer targeting; often limited mainly to the synovial membrane | Better targeting and broader cell transduction |
| Safety | Generally safer and easier to handle | Concerns regarding persistence in the host, inflammation, potential spread to other organs, and carcinogenesis |
| Immunogenicity | Less immunogenic | More immunogenic, although AAV is less immunogenic than other viral vectors |
| Cost | Potentially more cost-effective | Typically, more expensive to produce |
| Main advantage | Safety, simplicity, and easier handling | Higher efficiency, longer-lasting and stronger gene delivery performance |
Comparison between viral and non-viral vectors.
Gene delivery vectors include:
Non-viral vectors
lipid-based systems
liposomes
polymers
nucleic acid conjugates
naked DNA
- •
Viral vectors
adenovirus
AAV (scAAV, rAAV)
retrovirus
lentivirus
baculovirus
The main advantage of viral vectors is high transfection efficiency. However, major concerns include persistence of viral material in the host, local inflammation, possible spread to other organs, carcinogenesis, immunogenicity, and high production costs (Table 2) (101).
Adenoviruses are commonly used because they achieve high transduction efficiency and transgene expression in several cell types, making them suitable for in vivo approaches and for the transfer of growth factor genes. Their main limitation is the short duration of expression, typically only 1–2 weeks, because the vector remains episomal. Clinical concerns also include humoral and cellular immune responses to adenoviral gene products. To reduce these risks, modified “gutless” adenoviral vectors containing only the packaging sequence and terminal repeats may be used; these offer improved safety but can still trigger innate immune responses if given systemically and require a helper virus for transduction, which adds complexity (95).
Among viral vectors, adeno-associated virus (AAV) is widely regarded as the leading candidate for in vivo intra-articular delivery of therapeutic cDNAs. AAV can penetrate deep into articular cartilage, transduce chondrocytes in situ, and may support transgene expression for months to years, with some reports suggesting persistence of action for up to 10 years, potentially reducing the need for repeated injections (103). AAV is considered effective and relatively safe, as it is not known to cause disease and is generally less immunogenic than other viral vectors, although immune reactions may still occur after repeated administration (94, 95, 98, 103). The most commonly used serotypes are 2 and 5, and the main forms are recombinant AAV (rAAV) and self-complementary AAV (scAAV). rAAV is derived from the non-pathogenic parvovirus AAV after removal of viral coding sequences, which helps minimize host immune responses. In addition, rAAV does not require cell division or vector integration for gene expression and can sustain high-efficiency expression for extended periods. scAAV has been used for the delivery of IL1-Ra (96, 97, 99, 101). Because AAV cannot replicate independently, it requires complementation by proteins supplied by an adenovirus. Even so, AAV remains the preferred viral vector for in vivo delivery, whereas retroviruses are generally preferred for ex vivo delivery in both OA and RA (95, 99).
Retroviruses are limited mainly by insertional mutagenesis and the potential activation of oncogenes. For this reason, they are usually used in ex vivo settings after irradiation with gamma or X-rays to render viral replication incompetent (97, 101). Lentiviruses, a subclass of retroviruses derived from HIV, can transduce non-dividing cells and have therefore been proposed as vectors. However, concerns remain about introducing HIV-derived genetic material in vivo and about vector integration, which may lead to insertional transformation and tumor formation. Although non-integrating lentiviral systems have been developed, they are not yet widely available (97, 98).
Baculovirus is used less often because it neither replicates nor integrates its DNA, resulting in only very transient gene expression, typically for less than 7 days (97).
In cell-based applications, some studies suggest that MSCs have limited chondrogenic differentiation and immunomodulatory capacity even after enhancement with viral or non-viral vectors. In addition, bone formation and fibrocartilage may develop instead of hyaline cartilage (97, 99–101).
In animal models of tendinopathy, exosomes—nanometre-sized extracellular vesicles involved in cell-to-cell communication—have been studied in adipose-derived stem cells, educated macrophages, tendon stem cells, and bone marrow-derived MSCs, with encouraging effects on tendon repair (100).
Non-viral vectors are generally preferred when safety and simplicity are the priority. Viral vectors are generally preferred when high-efficiency gene delivery is needed. AAV stands out among viral vectors because it offers a relatively favorable balance between efficacy and safety. However, only a small number of the approaches described above have begun to reach experimental human intra-articular application, usually in combination with viral vectors (98). One example is a mixture of non-transformed and retrovirally transduced, irradiated allogenic primary chondrocytes overexpressing TGF-β for OA (96, 99, 101, 104, 105).
Overall, intra-articular GT remains at an early stage compared with gene therapy for monogenic diseases, largely because the underlying disorders have complex and still incompletely understood aetiologies (95). Current barriers include transient transgene expression, suboptimal concentrations of target proteins (despite occasionally reaching supra-therapeutic levels shortly after treatment), inability to restore normal cartilaginous architecture, and high cost. Potential strategies to address these limitations include binding motifs that prolong local protein residence time and scaffold-based cell therapies. Nevertheless, important safety questions remain, and robust efficacy data are still required before GT can be adopted routinely in clinical practice (97, 99).
Key take-home messages
Gene therapy remains largely experimental in musculoskeletal medicine, with most evidence derived from preclinical studies.
AAV vectors currently represent the leading platform because of prolonged expression, cartilage penetration, and a favorable safety profile.
Major therapeutic targets include anti-inflammatory cytokines, growth factors, transcription factors, and non-coding RNAs.
Improvements in vector design have improved safety; however, concerns about immune reactions and oncogenesis persist.
Experimental models suggest enhanced repair with cell-based therapies, although differentiation remains variable and tissue quality is inconsistent.
Clinical translation is limited by high costs, safety concerns, transient or suboptimal protein expression, and inconsistent tissue regeneration.
Current evidence and regulatory concerns do not yet support routine clinical use, and further high-quality human trials are required to establish efficacy, durability, and long-term safety.
Hyaluronic acid
Endogenous hyaluronic acid (HA), also known as hyaluronan, is a glycosaminoglycan synthesized by three membrane enzymes: HA synthetases 1, 2, and 3 (HAS1, HAS2, and HAS3). It is formed through the repeated addition of disaccharide units of glucuronic acid and N-acetyl-D-glucosamine (106, 107). In normal human synovial fluid, HA is present as polymers with a molecular weight of approximately 4,000 kilodaltons. These polymers can retain up to 1,000 times their own weight in water, a property that underlies HA’s marked hydrophilicity and its important roles in joint lubrication and shock absorption (107).
Sources and formulations
Exogenous HA may be produced by microbial enzymatic synthesis or extracted from rooster combs. Microbial production enables large-scale manufacturing, but bacterial strains may mutate or produce endotoxins that can trigger immunological hypersensitivity reactions. HA derived from rooster combs is contraindicated in patients with egg or poultry allergies and also poses challenges to achieving ultrapurification of the final product (107).
Commercial HA preparations also differ in several practical characteristics, including: concentration, typically ranging from 0.8 to 2.2%; ampoule volume; whether the product is cross-linked; molecular weight; and dosing regimen, which may range from a single injection to five weekly injections (107)
Mechanisms of action
HA has mechanical, chondroprotective, and anti-inflammatory effects.
The mechanical effects: HA acts as a lubricant, increases synovial fluid viscosity, absorbs shock, and stimulates endogenous HA production. These properties may help explain why clinical benefit can last for several months.
The chondroprotective effects: HA may reduce enzymatic cartilage degradation and chondrocyte apoptosis while increasing proteoglycan/glycosaminoglycan and collagen synthesis, as well as chondrocyte proliferation.
The anti-inflammatory effects: HA suppresses the expression of TNF-α, IL-1β, IL-6, IL-17, MMP, and PGE2 and reduces nitric oxide and free radicals.
These actions are mediated through binding to molecules such as hyaladherins, toll-like receptors, and layilin. Hyaladherins, or hyaluronan-binding proteins, include CD44, CD168/RHAMM, hyalectan, TSG-6, HABP1, and HABP2. They are involved in cell adhesion, extracellular matrix support, cell signaling, and cell migration, all of which contribute to tissue healing (, 107–110).
Conversely, inflammatory mediators and reactive oxygen species reduce both HA production and molecular weight, thereby impairing its concentration, viscosity, and function (107).
Molecular weight considerations
HA is commonly classified by molecular weight as follows: low molecular weight, < 800 kDa; medium molecular weight, 800–2,000 kDa; and high molecular weight, > 3,000 kDa (108–110).
Although higher-molecular-weight or cross-linked preparations tend to remain in the joint longer before enzymatic degradation, molecular weight has not consistently been shown to influence clinical outcomes (, 107). Medium- to high-molecular-weight HA may more closely mimic endogenous HA; however, very high molecular weight preparations may reduce the availability of free binding sites on the cell surface and potentially impair endogenous HA biosynthesis (110).
High-molecular-weight HA also appears to exert anti-inflammatory effects by regulating immune-cell recruitment. In contrast, low-molecular-weight HA may promote angiogenesis and tissue remodeling but can also exert pro-inflammatory effects on chondrocytes (110).
Clinical indications and overall evidence
Common musculoskeletal indications for HA include osteoarthritis (OA) and tendinopathies. Randomized controlled trials, systematic literature reviews, and meta-analyses have shown improvements in pain and function for knee OA, first carpometacarpal and shoulder OA. By contrast, evidence for hip, ankle, and elbow OA remains much less certain, although treatment is generally well tolerated and safe (, 107, 111–120).
Knee osteoarthritis: HA versus corticosteroids
A systematic literature review and meta-analysis comparing intra-articular HA with intra-articular corticosteroids (CS) in knee OA included 12 randomized controlled trials and 1,794 patients. Corticosteroids provided greater short-term pain relief, up to 1 month; however, by 6 months, the effect favored HA. Both treatments improved knee function to a similar extent and had comparable safety profiles, although HA was associated with more local adverse events (121).
Knee osteoarthritis: HA plus PRP versus PRP alone
A systematic literature review and meta-analysis assessed the combination of intra-articular HA with platelet-rich plasma (PRP) versus PRP alone for knee OA. The analysis included 7 randomized controlled trials and 3 cohort studies, comprising 983 patients. Although the authors noted the lack of large, high-quality studies, the best available evidence suggested that combined treatment was superior to PRP alone for pain relief and functional improvement for up to 12 months (122).
Glenohumeral osteoarthritis
Another systematic literature review and meta-analysis, including 15 randomized controlled trials and 1,023 patients, evaluated intra-articular HA in glenohumeral OA. HA was more effective than corticosteroid injections, and the combination of HA with physiotherapy provided greater pain relief than physiotherapy alone (108). Only one study compared HA with PRP in glenohumeral OA, and no difference was found between the two groups (108).
Soft tissue indications
For soft tissue indications, HA is administered as soft tissue-adapted biocompatible hyaluronic acid (STABHA) (123). It has been used in ankle sprains, adhesive capsulitis, epicondylosis, and rotator cuff, Achilles, and patellar tendinopathies, with promising results. The strongest evidence currently relates to rotator cuff tendinopathy, including partial tendon tears and shoulder impingement syndrome (106, 123, 124).
A systematic literature review evaluating HA for soft tissue conditions compared it with placebo and other treatments, including PRP, CS, prolotherapy, and physical therapy. Across 19 randomized controlled trials involving 1,629 patients, HA was favored for pain relief in the short term (≤ 6 weeks) and mid-term (≤ 12 weeks), and for functional improvement up to 6 weeks. No major adverse effects were reported apart from injection-site discomfort (124).
Some condition-specific findings differed. For trigger finger, corticosteroids were superior to HA for short-term pain relief. In rotator cuff tendinosis, HA and extracorporeal shock wave therapy performed similarly, whereas HA was superior in Achilles tendinopathy. In patellar tendinopathy, HA performed similarly to PRP (124–127).
Combination therapies and current recommendations
HA may be used alone or combined with other agents, including corticosteroids, PRP, ozone (O3), lactose-modified chitosan, and chondroitin sulfate. Some of these combinations may enhance HA efficacy in knee OA, although the supporting evidence remains limited (110, 128, 129).
Viscosupplementation Consensus Groups recommend intra-articular knee HA in selected situations, including:
patients who previously responded well to HA injections;
younger patients at high risk of OA progression;
competitive athletes seeking to slow OA progression; and
symptomatic adults with clinically and radiographically confirmed mild-to-moderate knee OA who have not yet received other therapies, have failed pharmacological or non-pharmacological treatment, or have had an incomplete response to previous therapies (130, 131).
Safety
Reported adverse events include synovitis in patients with concomitant calcium pyrophosphate deposition disease and granulomatous synovitis.
Remaining uncertainties
Despite the growing body of evidence, important questions remain regarding the optimal HA regimen, product origin, and ideal molecular weight (high versus low), largely because the available evidence is still insufficient to resolve these issues conclusively (, 108, 109, 113, 132).
Hydrodissection/brisement
Hydrodissection (HD), also known as percutaneous hydrostatic decompression or brisement, involves injecting a large volume (up to 15 mL) of 5% dextrose in water (D5W) around an affected nerve to separate it from nearby tissues. Other injectables besides D5W or normal saline (NS) have a volume limitation (CS, PRP, hyaluronidase), making them unsuitable for large-volume applications (133). HD may be associated with a local anesthetic (LA), with or without a CS, and may also be combined with PRP or HA ().
A local anesthetic is used along the needle path, but care is taken not to inject it too close to the nerve to prevent temporary paralysis or nerve toxicity. Then D5W is injected to separate the nerve from the surrounding tissue. An in-plane technique having the nerve in a short-axis view is the best method for conducting an HD. The needle should first approach the deep surface of the nerve, having its bevel facing up. When fluid is injected, the resistance from the soft tissue guides the needle deeper, which helps prevent nerve injury. The procedure is repeated, this time with the needle nearing the nerve’s surface and its bevel facing downward (Figure 6). The procedure is complete when the nerve is seen surrounded by fluid. When a long section of the nerve is compressed, the same needle entry point is maintained, but both the probe and needle can be angled from the proximal to the distal end of the entrapment, repeating the hydrodissection at each site. Simultaneous HD proximal and distal to the entrapped nerve may be more effective than just one procedure, but it surely is more challenging technically. For carpal tunnel syndrome, which is the most common entrapment neuropathy, there is the recommendation of introducing the needle through the “transverse safe zone”, which is the space between the ulnar border of the median nerve and the radial border of the ulnar artery or through the “longitudinal safe zone”, which is the space between the distal part of the carpal annular ligament and the superficial palmar arch (133–136). Certain authors recommend combining the transverse ulnar approach with a longitudinal approach running from proximal to distal between the first and second carpal rows, employing a high volume (10 ml) of D5W (136).
FIGURE 6
The outcome of any HD will reflect the retention time and volume of the injectate, the entrapment grade and location, and the number of treatments, which may vary between 1 and 5, 1–4 weeks apart, in case of multiple treatments (133–135).
HD with D5W likely offers combined mechanical, pharmacological, and neuroregenerative benefits. The mechanical benefit may relate to the separation of the injured nerve from the surrounding soft tissues, lowering adhesions, allowing nerve mobilization, and releasing compressed nervi nervorum and vasa nervorum. The pharmacological effect of D5W, opposed to what happens with NS, results from a direct analgesic action while downregulating capsaicin-sensitive receptors, which are present in peripheral nerves, tendons, ligaments, and joints, impeding the release of SP and CGRP. Moreover, D5W may have an antinociceptive action through a decrease in C-fiber activation by reversing the local hypoglycemic status. Possible neuroregenerative effects of D5W explain the long-term benefits of the procedure (133, 134, 137). The pharmacological and neuroregenerative actions of D5W justify why D5W is more effective than NS in relieving symptoms of nerve entrapment and is the most common option in perineural HD (133, 135).
Common indications include entrapment neuropathies and neuromas, and less often Achilles tendinopathy and adhesive capsulitis (, 133–136, 138, 139).
Concerning carpal tunnel syndrome, 4–10 mL D5W HD proved to be more effective than CS injections or 1–2 mL D5W HD, and a 10 ml volume of D5W seems to be the best option (136, 140–144). In ulnar nerve entrapment at the elbow, 5 ml D5W HD was as effective as an injection of CS plus NS, considering that the non-superiority of HD could be due to the particular anatomy of the ulnar tunnel, allowing the spilling of the injectate into other layers (145). HD with D5W on cervical root compression, thoracic outlet syndrome, or cervicogenic headache provided more than 50% relief, although sometimes only after several treatment courses (146). Several case reports were also published showing improvements after D5W HD in sensitive radial nerve entrapment (2 mL D5W), supinator syndrome, and superficial peroneal nerve entrapment (5 mL D5W each), meralgia paresthetica and pronator teres syndrome (10 ml D5W each), and radial nerve palsy (15 mL D5W), using 1–7 treatments (134). Other studies compared intra-articular CS injection with HD in shoulder adhesive capsulitis and found the two approaches equally effective (138). Additional HD targets include the stellate ganglion, brachial plexus, cervical nerve roots, and paravertebral spaces (135).
Specific AE may be due to anesthetic toxicity or allergy, if a LA is used in the context of the HD, or may be the result of nerve damage by the needle.
Mesenchymal stromal cells
Stem cells can be classified by lineage commitment and differentiation potential into pluripotent stem cells (PPSCs) and multipotent stem cells (MPSCs). PPSCs, which include embryonic stem cells and induced pluripotent stem cells, can differentiate into any specialized cell type. In contrast, MPSCs, such as mesenchymal stem cells or mesenchymal stromal cells (MSCs), are limited to differentiation within a single germ layer (). MSCs can differentiate into mesodermal tissues, including cartilage, bone, tendon, meniscus, muscle, and adipose tissue, which underpins their relevance in regenerative medicine. They also exert important paracrine effects and can modulate the local microenvironment. However, their multipotency has been demonstrated mainly in vitro rather than in vivo, although they can stimulate endogenous stem cell activity and secrete immunomodulatory bioactive factors that support tissue repair (147). MSCs are also thought to have a perivascular origin. This evidence underlies the shift in terminology from mesenchymal stem cells to mesenchymal stromal cells, although the term “medicinal signaling cells” has also been proposed while retaining the acronym MSCs (148).
MSCs may be derived from several sources:
- •
Bone marrow-derived (BM-MSCs)
bone marrow aspirate (BMA)
bone marrow aspirate concentrate (BMAC)
mix (BMA+BMAC)
hybrid bone marrow aspirate concentrate (HBMAC)
- •
Adipose tissue-derived MSCs (AD-MSCs)
stromal vascular fraction (SVF)
macroscopic fat tissue (Macro-FAT)
microfragmented fat tissue (MFAT)
nanofat tissue NFAT
- •
Other sources of MSCs
HBMAC combines BMAC with other orthobiologic products, such as PRP, platelet-rich fibrin (PRF), HA, growth factors (GFs), or gene therapy. Other sources of MSCs include amniotic-based products, umbilical cord, peripheral blood, skin, synovium, and the infrapatellar fat pad (, 147, 149–153).
The International Society for Cellular Therapy proposed minimum criteria for cells to be classified as human MSCs: the cells must be able to differentiate in vitro into chondrogenic, osteogenic, or adipogenic tissue; they must express CD73, CD90, and CD105 markers, but not HLA-DR, CD11b, CD14, CD19, CD34, CD45, or CD79a; and they must be able to adhere to plastic under standard culture conditions (153, 154).
BM-MSCs are generally obtained from the patient’s bone marrow, most commonly harvested from the posterior superior iliac crest. Aspirated volumes should exceed 8 ml to improve consistency in cell yield. Bone marrow contains osteoblasts, osteoclasts, macrophages, endothelial progenitor cells, hematopoietic stem cells, and MSCs. In the case of BMAC, the aspirate is centrifuged to concentrate MSCs. The therapeutic effects of bone marrow-derived orthobiologic products are thought to result from both MSCs and hematopoietic stem cells. In addition, MSCs are believed to correspond to pericytes or perivascular cells, whose properties may vary according to the vascular niche in which they reside (148, 153).
AD-MSCs are obtained by means of a vacuum-locked syringe system or power-assisted liposuction, with or without prior administration of Klein’s or tumescent solution (lidocaine, normal saline, and epinephrine), to facilitate aspiration of abdominal subcutaneous fat. The harvested material is subsequently processed using techniques such as enzyme treatment, centrifugation, and washing (153). AD-MSCs may be prepared through three principal approaches: (1) SVF, obtained using enzymes such as collagenase, dispase, or trypsin, and composed of MSCs, endothelial progenitor cells, macrophages, pericytes, preadipocytes, and smooth muscle cells; (2) MFAT, produced through mechanical fragmentation of adipose tissue using metal beads or progressively smaller sieves combined with repeated saline washing, thereby avoiding enzymatic digestion; and 3) NFAT, generated by emulsification and filtration of the lipoaspirate, yielding a product that contains fragments of arterioles, venules, and capillaries, together with GFs, peptides, and cytokines (153).
In addition to AD-MSCs and BM-MSCs, several other MSC sources have been described, although these are limited by the relatively small amount of material that can be obtained. Amniotic-based products are derived from placental tissue obtained from donors undergoing elective cesarean section, after blunt dissection to separate the amniotic membrane from the chorion. The resulting product is stored in sterile vials following cryopreservation, freeze-drying, or gamma irradiation (153). Other perinatal products occasionally used include umbilical cord blood and Wharton’s jelly, both of which express several MSC-related genes and can be cultured and differentiated into multiple cell types (153).
MSCs are capable of self-renewal in vivo and display trophic, mitogenic, anti-fibrotic, anti-apoptotic, and immunomodulatory properties. They also retain the potential to differentiate into osteoblasts, myocytes, adipocytes, and chondrocytes (155). However, there is no definitive in vivo evidence that MSCs directly differentiate in sufficient numbers to replace damaged tissues, and studies have shown that fewer than 1% of injected cells remain after as little as 7 days (156, 157). Nonetheless, MSCs may be recruited by chemokines released from injured tissues. Once localized to the target site, they appear to coordinate reparative responses through autocrine and paracrine mechanisms, delivering GFs, cytokines, and other bioactive mediators such as angiopoietin 1 and 2, bone morphogenetic proteins, IL-6, VEGF, TGF-β, stromal-derived factor, stem-cell factor, and brain-derived neurotrophic factor. Through these mechanisms, MSCs may reduce fibrosis, apoptosis, and inflammation, including inhibition of pro-inflammatory cytokines such as IL-1, IL-6, and INF-γ, as well as modulation of type 1 macrophages, NK cells, and B and T leucocytes, while promoting tissue repair (147, 153).
Macro-FAT, MFAT, BMA (0.01–0.1%), BMAC (1–5%), Nano-FAT (2–5%), and SVF (15–30%) contain progressively increasing concentrations of MSCs, with Macro-FAT and MFAT used almost exclusively to provide structural support and cushioning (153, 158, 159).
The methods used to prepare BMAC are highly variable, which limits the comparability of treatments, and studies have so far failed to demonstrate any clear regenerative effect (). Regarding autologous BM-MSCs, these usually need to be culture-expanded because of their limited number in a one-stage harvest protocol. Allogeneic MSCs are an alternative because they lack significant immunogenicity, which facilitates transplantation (147). In fact, allogeneic BM-MSCs are easy to obtain and allow the manufacture of larger amounts of product, although they also need to be culture-expanded (, 160).
Adipose tissue has several advantages over other tissues as a source of MSCs, namely its abundance, ease of harvesting with minimal invasiveness, and a stable phenotype after many culture passages (). Regarding SVF, it can be delivered in two different ways: through intra-articular injection of cells suspended in PRP or through surgical implantation. In the first case, because SVF is always suspended in a volume of PRP, there is no information regarding the regenerative effects of pure SVF in OA ().
There are three ways of combining MSCs and PRP: using PRP lysates of bovine origin during laboratory expansion of MSCs; priming MSCs with PRP after cell expansion but before transplantation to improve their differentiation capabilities; and using PRP as a vehicle to confine MSCs to a chosen site and enhance the biological action of the implanted cells (151).
When administered intra-articularly to osteoarthritic joints, MSCs appear to adhere to damaged tissue surfaces and may protect against further cartilage degeneration through restoration of chondrocyte homeostasis and enhancement of matrix synthesis, potentially resulting in anatomical improvement, pain reduction, functional benefit, and a favorable safety profile. Similarly, MSCs have been proposed to enhance tendon healing by differentiating into tenocyte-like cells and secreting relevant growth factors and cytokines. Although direct differentiation into the desired target cell type, after injection into injured tissue, remains possible, the preponderance of evidence suggests that their principal mode of action is paracrine, promoting and coordinating regenerative and reparative processes. Accordingly, the primary therapeutic effects of MSCs are more likely to depend on their trophic and immunomodulatory properties than on direct replacement of damaged or absent tissue (, , , 152, 153, 160).
Current indications for MSC-based therapies include osteoarthritis (OA), tendinopathies, focal cartilage defects, and spinal conditions. Among these, knee osteoarthritis has been the most extensively studied indication, with encouraging results reported in relation to pain, function, quality of life, and cartilage-related outcomes following intra-articular administration of BMAC, AD-MSCs, or peripheral blood-derived MSCs. In comparative studies, MSC-based therapies have frequently shown better outcomes than NS, CS, or HA, and adverse events have generally been mild and self-limited, most commonly transient pain and swelling (, , , , , 149, 150, 155, 160). Combination therapy using MSCs with HA or PRP may yield better results than MSCs alone, although this finding has not been consistent across all studies (, , 151, 152).
In vitro metabolic activity and viability of AD-MSCs appear to be adversely affected by the addition of local anesthetics such as lidocaine, bupivacaine, or ropivacaine at clinically relevant concentrations, with ropivacaine showing comparatively less toxicity. This detrimental effect appears to be proportional both to anesthetic concentration and to exposure time (161). Whether these findings translate into clinically relevant in vivo effects remains uncertain.
Despite promising findings regarding MSCs, several issues remain unresolved, including identification of the optimal MSC source, standardization of harvesting, culture expansion, and administration protocols (including dosage, volume, timing, and number of injections), and determination of the most appropriate stage of disease for treatment (150, 155, 156, 160). Some studies have reported contradictory results regarding high- versus low-dose AD-MSCs, as well as injection versus implantation strategies using BM-MSCs (). A moderate cell dose (40 × 106) appears to produce the most favorable outcomes in Kellgren grade ≥ 2 knee osteoarthritis. Noticeably, allogeneic MSCs may still be recognized by the host immune system, suggesting that lower doses could be preferable in some settings (, 150). Nevertheless, there is strong evidence for the safety of MSC administration when performed by trained physicians, with the appropriate precautions, under image guidance, and using a sterile technique (148).
Overall, the inherent complexity of MSC-based therapies, together with the lack of high-level evidence and persistent methodological heterogeneity, continues to limit their routine incorporation as MIMSPs. Efforts to address some of these limitations are reflected in the ACH classification proposal, which seeks to standardize best practices for BM-MSC-based products (147).
Statements
Author contributions
FS: Writing – review & editing, Methodology, Funding acquisition, Conceptualization, Writing – original draft, Investigation, Supervision, Data curation, Visualization, Resources, Formal analysis, Validation, Project administration. EN: Formal analysis, Data curation, Methodology, Visualization, Project administration, Supervision, Validation, Funding acquisition, Writing – review & editing, Resources.
Funding
The author(s) declared that financial support was not received for this work and/or its publication.
Conflict of interest
The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
ultrasound guidance, minimally invasive musculoskeletal procedures, botulinum toxin, corticosteroids, gene therapy, hyaluronic acid, hydrodissection, platelet-rich plasma
Citation
Saraiva F and Naredo E (2026) The evolving landscape of minimally invasive procedures in musculoskeletal diseases—part I. Front. Med. 13:1826391. doi: 10.3389/fmed.2026.1826391
Received
09 March 2026
Revised
07 June 2026
Accepted
16 June 2026
Published
10 July 2026
Volume
13 - 2026
Edited by
Heena Garg, All India Institute of Medical Sciences, India
Reviewed by
Sreyashi Naskar, Bangur Institute of Neurosciences, India
Dhruv Jain, All India Institute of Medical Sciences, India
Updates
Copyright
© 2026 Saraiva and Naredo.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Fernando Saraiva, fernando_saraiva@hotmail.com
Disclaimer
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