Anxiety and depression prevalence and associated factors in patients with knee osteoarthritis

Abstract

Objective:

With the evolving spectrum of diseases, psychological conditions such as anxiety and depression have emerged as significant global public health concerns. Notably, these psychological disorders are prevalent among patients suffering from knee osteoarthritis (KOA). Consequently, this study included 360 hospitalized patients diagnosed with KOA to examine their levels of anxiety and depression and to analyze the factors influencing these psychological states.

Methods:

A cohort of KOA patients from the Second Hospital of Shanxi Medical University was assessed using a general condition questionnaire, European five-dimensional health status scale (EQ5D), Western Ontario and McMaster University Osteoarthritis (WOMAC), Social Support Rating Scale (SSRS), and Hospital Anxiety and Depression Scale (HADS). Logistic regression analysis was employed to identify the factors affecting anxiety and depression.

Results:

Among 360 patients with KOA, 28.06% experienced anxiety, and 30.27% experienced depression. Multivariate logistic regression analysis showed that lower BMI, QOL, and utilization of social support scores are risk factors for anxiety and depression in KOA patients (P<0.05). Additionally, in patients with KOA, younger age, lower subjective support, and higher scores in function and daily activities emerged as significant risk factors for depression (P<0.05).

Conclusion:

Anxiety and depression in patients with KOA warrant significant attention due to their impact on overall well-being. The factors influencing these mental health conditions are multidimensional. In clinical practice, it is essential to integrate these various influencing factors to develop targeted mental health care services. By doing so, healthcare providers can enhance the overall mental health and QOL for individuals suffering from KOA.

1 Introduction

Knee osteoarthritis (KOA) is a prevalent chronic condition, particularly among individuals over 50 years of age (1). The primary pathological features of this disease include the wear of articular cartilage, narrowing of the joint space, and remodeling of the subchondral bone (2). Patients typically experience clinical symptoms such as pain, stiffness, and movement disorders (3). Despite the numerous treatments available for KOA (4), effective options to delay disease progression remain lacking. Chronic pain and daily living difficulties significantly diminish patients’ quality of life (QOL) and increase their psychological burden, leading to varying degrees of anxiety, depression, and other psychological issues (5–7).

Research has shown a significant correlation between KOA and psychological issues such as anxiety and depression. Individuals with KOA have a higher prevalence of anxiety and are two to three times more likely to exhibit depressive symptoms compared to the general population (8, 9). Research indicates that the prevalence of anxiety and depression among patients with KOA varies significantly across different countries. In the United States, the prevalence is reported to be 11.1% (10), whereas in the Netherlands, it is higher at 25.7% (11). Notably, in China, the prevalence rates of anxiety and depression were 29.2% and 37.5% (12), respectively exceeding those in the USA and the Netherlands. Additionally, studies have identified specific demographic factors that increase the likelihood of developing depression among KOA patients (13). These factors include being female, younger in age, having a higher body mass index (BMI), and possessing a lower level of education (14). Emotional problems such as depression and anxiety are recognized as risk factors that may accelerate the progression of KOA. Previous research indicates that anxiety and depression can lead to physical dysfunction, which in turn affects patients’ mobility. This reduction in physical activity can hinder pain and inflammation relief, potentially trapping KOA patients in a cyclical pattern of pain (15, 16). Moreover, studies have found a positive correlation between the severity of depression and the intensity of pain symptoms in KOA patients. Depression symptom not only has the potential to accelerate the progression of KOA but may also exacerbate other psychological issues (17).

At present, the relationship between anxiety, depression, and KOA has garnered significant attention in the medical community (18). Therefore, The purpose of this study was to explore the current situation of anxiety and depression in the KOA population and analyze its influencing factors so as to provide a theoretical basis for the subsequent formulation of targeted psychotherapy programs to reduce the occurrence of anxiety and depression in the KOA population.

2 Methods

2.1 Participants

This study is a cross-sectional study. This study involved patients with KOA who visited the Osteoarthritis Department at the Second Hospital of Shanxi Medical University from June to August 2024. A total of 375 patients met the inclusion and exclusion criteria. The diagnostic criteria for primary KOA included: (1) The patient had experienced recurrent knee pain in the past month. (2) An X-ray taken in a standing or weight-bearing position should reveal narrowing of the joint space, sclerosis of the subchondral bone, cystic degeneration, or osteophyte formation at the joint edge. (3) Synovial fluid analysis, conducted at least twice, should show transparent and viscous fluid with a white blood cell count of less than 200/ml. (4) Elderly patients aged 40 years and older. (5) The presence of morning stiffness lasting no more than three minutes. (6) Bone fricative or bone rubbing sensation when moving. A diagnosis of KOA can be confirmed if the criteria of either (1) and (2), or (1), (3), (5), and (6), or (1), (4), (5), and (6) are satisfied.

Inclusion criteria: (1) Complies with diagnostic criteria for primary KOA. (2) Age 40 years or older. (3) The ability to provide conscious and voluntary consent to participate in this study. Exclusion criteria: (1) Knee joint pain attributed to conditions other than osteoarthritis, such as rheumatoid arthritis or osteonecrosis. (2) Cognitive impairments or mental and behavioral disorders. (3) History of knee joint trauma, including sprains, contusions, or other injuries. (4) Severe pain in other joints or the presence of spinal and hip joint diseases that cause radiation pain in the lower limbs. (5) Systemic malignant tumors or tumors located around the knee joints. (6) Previous knee surgery. A flowchart detailing patient inclusion and exclusion is shown in Figure 1.

Figure 1

2.2 Data collection

This study employed a cross-sectional design, wherein basic demographic and clinical information were gathered through a structured questionnaire. For patients who met the inclusion and exclusion criteria, the investigator provided a detailed explanation of the study’s purpose and content to both the patients and their family members. Upon obtaining informed consent, the investigator administered the questionnaire on the first day of the patient’s admission, prior to the commencement of treatment.

2.3 Measurement tools

(1)General situation survey form: The general situation questionnaire was self-designed, including gender, age, BMI, education, marital status, place of residence, monthly per capita family income, medical payment method, occupation, the number of affected knee joints, disease duration, and the presence of swelling in the affected knee joint. (2) The WOMAC is a valuable tool for assessing the severity and treatment effects of KOA. This scale encompasses three dimensions: pain, stiffness, and functional ability in daily activities. It comprises 24 items addressing the fundamental symptoms and signs of KOA and can be completed quickly. Higher scores reflect poorer knee function (19). (3) The EQ-5D is a tool used to assess the health status of a population. It comprises two main components: a questionnaire and a utility conversion table. The questionnaire evaluates five dimensions of health: mobility, self-care ability, daily activity ability, pain or discomfort, and anxiety or depression. Each dimension allows respondents to report their status as “no problem,” “moderate problem,” or “severe problem.” After completing the questionnaire, the responses are converted into a score using the utility conversion table. A score closer to 1 indicates a higher QOL. (4) The SSRS is a valuable tool for assessing the social support experienced by individuals. This scale comprises ten items that evaluate three dimensions: objective support, subjective support, and the utilization of social support. Objective support encompasses tangible, visible, or actual support, such as direct material assistance, as well as the presence and involvement of social networks and group affiliations. Subjective support, on the other hand, pertains to the emotional experiences of individuals, precisely their feelings of being respected, supported, and understood within society. The utilization of the social support dimension examines the variations in how individuals make use of the social support available to them. The cumulative scores from these three dimensions are interpreted as follows: a total score of less than 20 indicates low social support, a score between 20 and 30 signifies general social support and a score greater than 30 reflects satisfactory social support.

(5) The HADS is a self-reported scale used to screen and assess anxiety and depressive moods in general hospital patients, especially those experiencing symptoms due to physical illness. It demonstrates good internal consistency and test-retest reliability (20). The assessment tool comprises 14 items, with seven items dedicated to evaluating depression and the other seven focused on assessing anxiety. The anxiety scale is denoted by ‘A,’ while the depression scale is represented by ‘D.’ Each item is rated on a 4-point scale ranging from 0 to 3. For each subscale, a total score between 0 and 7 indicates the absence of anxiety or depression, whereas a score of 8 or higher signifies the presence of anxiety or depression (21).

2.4 Sample size

The sample size typically ranges from five to ten times the number of independent variables. In this study, A total of 15 factors were used as a basis, including 12 factors such as age, gender, and education level from a general situation questionnaire, as well as three scoring scales including WOMAC, SSRS, and EQ-5D. To account for the influence of response rates, we expanded the sample size by 10%. Using the formula: sample size = number of independent variables × 10/(1 - 10%), we calculated the required sample size to be 167.

2.5 Statistical analysis

The data were analyzed using SPSS 27.0 statistical software. Measurement data were presented as mean ± standard deviation while counting data were expressed as frequency and percentage (%). Continuous variables were analyzed using either the t-test or the Mann-Whitney U test. Categorical variables underwent univariate analysis through the chi-square test or Fisher’s exact test. For multivariate analysis, logistic regression was employed. A p-value of less than 0.05 was considered statistically significant.

3 Results

3.1 General demographic and disease characteristics

A total of 375 questionnaires were distributed, resulting in the recovery of 360 valid responses, yielding an effective recovery rate of 96%. Among the valid questionnaires, 92 respondents were male, and 268 were female. The average age of participants was 64.02 years, with a mean BMI of 25.52 kg/m². The predominant marital status is married. Regarding education levels, 243 participants had completed junior high school or lower, 94 had attended high school or junior college, and 23 had obtained a university degree or higher. The majority are either retired or unemployed. The residential distribution included 181 urban residents and 179 rural residents. Families with a monthly per capita income below 2000 yuan constitute a significant proportion. Regarding medical payment methods, 350 respondents had medical insurance. See Table 1 for specific demographic characteristics and disease distribution.

3.2 Anxiety and depression in patients with KOA

In this study involving 360 patients with KOA, anxiety was identified in 101 patients. Additionally, depression was observed in 109 cases.

3.3 The QOL and social support of patients with KOA

The QOL score for patients with KOA was 0.81 ± 0.08, with a maximum possible score of 1, representing the ideal state, and a minimum score of 0.48. Among the 360 KOA patients surveyed, none reported having low social support, while 64 patients had general social support, and 296 patients reported satisfactory social support. Patients with anxiety or depression scored significantly lower in all dimensions of the social support scale compared to those without these conditions (P<0.05). Furthermore, patients with satisfactory social support had lower scores on the WOMAC, as well as lower anxiety and depression scores, compared to those with general social support (P<0.05). For further details, refer to Tables 2 and 3.

3.4 Univariate analysis of anxiety and depression in patients with KOA

The findings indicate statistically significant differences in anxiety levels based on several factors, including BMI, education, residence, professional status, medical payment methods, pain severity, stiffness, function and daily activities, QOL, and utilization of social support (P<0.05). In contrast, no significant differences were observed concerning age, disease duration, or monthly income (P>0.05). Similarly, significant differences in depression levels were found in relation to age, BMI, education, residence, monthly income, medical payment methods, stiffness, function and daily activities, QOL, subjective support, and utilization of social support (P<0.05). However, no statistical differences were noted in occupation, disease duration, or pain severity (P>0.05). For further details, refer to Tables 4 and 5.

3.5 Multivariate analysis of anxiety and depression in patients with KOA

A logistic regression analysis was conducted to examine the relationship between various factors and the incidence of anxiety and depression in patients with KOA. The analysis identified several significant independent variables influencing anxiety, including BMI, QOL, and utilization of social support. Specifically, lower BMI reduced QOL, and diminished utilization of social support were associated with an increased likelihood of anxiety among KOA patients (P < 0.05). In addition, the analysis revealed that age, BMI, QOL, function, and daily activities score, subjective support, and utilization of social support were significant factors affecting depression in this population. Younger age, lower BMI, poorer QOL, and lower levels of both subjective support and utilization of social support correlated with a higher probability of depression. Conversely, a higher score in function and daily activities was also linked to increased depression risk (P < 0.05). Detailed results can be found in Tables 6 and 7.

4 Discussion

In this study, the HADS was employed to assess anxiety and depression in patients with KOA. The objective was to understand these pathological emotions and explore their influencing factors to enhance clinical guidance and improve diagnostic and treatment strategies. The findings indicated that body BMI, QOL, and utilization of social support were negatively correlated with anxiety symptoms in KOA patients. Additionally, age, BMI, QOL, subjective support, and utilization of social support were negatively correlated with depressive symptoms, whereas functional and daily activity scores showed a positive correlation with depressive symptoms.

The global prevalence of osteoarthritis is approximately 30% (22). Among these patients, one in five experiences symptoms of anxiety and depression (23).KOA is associated with anxiety and depression, and several high-quality clinical trials have confirmed that the antidepressant Duloxetine can effectively relieve pain symptoms and improve knee function in patients with KOA. Therefore, some scholars propose that there may be a standard central mechanism between KOA and depression. Further research indicates that chronic pain leads to atrophy in brain regions responsible for regulating mood and managing emotions (24). This atrophy can disrupt emotional homeostasis, impairing the ability to respond to stressors. Consequently, KOA patients may feel isolated and experience a decline in self-efficacy, making them more susceptible to anxiety and depression (25, 26).

Our study revealed that among individuals over the age of 40, younger participants are more susceptible to depression. This increased likelihood of depression may be attributed to stressors related to family, work, and social environments. Additionally, patients with KOA who have a low BMI experience a diminished QOL due to poor nutritional status. This nutritional deficiency may contribute to a higher propensity for mood disorders in these patients compared to those with a higher BMI. These findings align with the research conducted by Hye (27). In addition, A meta-analysis revealed a significant correlation between depression and knee function in patients with KOA (28). Our findings support this correlation, indicating that patients with higher scores in activities of daily living are more susceptible to depression. Literature suggests that anxiety and depression can exacerbate pain symptoms in KOA patients, further limiting knee joint function. This cycle can lead to the emergence of additional psychological issues, ultimately diminishing patients’ QOL and intensifying depressive symptoms (29–32). Consequently, it is essential to address both clinical and psychological treatments simultaneously in the management of KOA patients to achieve optimal treatment outcomes. It should be noted that when exploring the relationship between pain symptoms and anxiety and depression, we did not observe meaningful results, which is inconsistent with previous research results (26, 33, 34). This discrepancy may be attributed to the clinical manifestations observed in KOA patients during this study, where symptoms such as pain, stiffness, and limited activity predominated. In contrast, fewer patients reported pain as the primary symptom. Consequently, the connection between pain and mood disorders warrants further investigation in future research.

An essential finding of this study is the significant correlation between anxiety, depression, and social support among patients with KOA. Social support refers to the emotional, material, and informational help and support that individuals receive from their social networks. Considerable attention has been given to its role in mediating somatic disability and depressive symptoms in the elderly (35). The impairment of daily activities in patients with KOA is recognized as a physical disability that significantly affects their QOL. This disability hinders their ability to perform basic self-care tasks and diminishes their capacity to engage with their social environment. Consequently, these limitations not only impact the physiological aspects of the patients but also have profound psychological effects, thereby elevating the risk of developing depressive symptoms (36). Adverse socioeconomic effects such as poverty, family breakdown, and emotional distress are also associated with depression (37). Research shows that social support can mitigate the adverse effects of physical disability on mental health. Conversely, patients with KOA are more likely to suffer from anxiety and depression when they lack adequate social support (38). Furthermore, our analysis revealed no multicollinearity between social support and QOL, indicating an absence of a significant correlation between these two variables. This finding suggests that the conclusions drawn in this study regarding the impact of social support and QOL on anxiety and depression are both stable and reliable. However, prior research has highlighted that different dimensions of social support may exert varying influences on health-related QOL. While this discrepancy may appear inconsistent with our findings, it is likely attributable to variations in research contexts, socioeconomic environments, measurement methodologies, and dataset characteristics (39). Thus, patients with KOA who lack sufficient social support often experience adverse psychological effects, including reduced self-esteem and limited social activities. These psychological challenges, in turn, heighten their need for social support and increase their vulnerability to depressive symptoms. So, when evaluating the reported outcomes of patients with KOA, it is essential to consider the level of social support they receive. This consideration is crucial, as the extent of social support can significantly influence the severity of self-reported symptoms and psychological issues (40). Additionally, studies have confirmed that patients residing in areas characterized by social deprivation, which is marked by low levels of social support, tend to report elevated depressive symptoms and diminished overall well-being (41–43). This highlights the interconnectedness of physical and mental health, suggesting that the social support level can significantly influence other domains. Consequently, establishing social support and positive psychological interventions is crucial for enhancing social support levels and improving the mental health of patients with KOA.

Our findings indicate significant mental health issues among patients with KOA, with high prevalence rates of anxiety and depression. A growing body of evidence underscores the detrimental effects of mental health problems on postoperative outcomes in KOA patients (44, 45), such as persistent pain and limited mobility diminishing the QOL for patients with KOA, warranting consideration by orthopedics doctors and experts when designing treatment plans or clinical pathways. Following diagnosis, a comprehensive approach that integrates pharmacological treatment, psychological therapy, counseling, and family support should be employed. This multifaceted strategy aims to enhance the quality of life for KOA patients and mitigate the incidence of anxiety and depression (46). Psychosocial interventions, including cognitive behavioral therapy and group acceptance and commitment therapy, play a crucial role in enhancing patient outcomes (47). These therapies can alleviate feelings of isolation and allow patients to learn from the experiences of others, thereby reducing anxiety and depression. Additionally, effective psychological interventions can diminish the pain experienced by patients with KOA. They also enhance self-efficacy, which in turn boosts both subjective and social support (48).

This study distinguishes itself from previous research, which primarily focused on general demographics and disease characteristics, by examining the relationship between QOL, social support levels, and the incidence of anxiety and depression among patients with KOA. It aims to determine whether enhancing QOL and social support can mitigate anxiety and depression, thereby offering a scientific basis for developing psychological intervention strategies. Furthermore, while existing research on the factors influencing anxiety and depression in KOA patients is more prevalent in the southern and eastern coastal regions of China, there is a lack of studies addressing these factors in the northern areas. This investigation and analysis of anxiety and depression in KOA patients from Taiyuan City and surrounding areas offer data to objectively evaluate these conditions and their influencing factors in northern China. The above contents are also the innovation of this study.

When conducting similar studies in the future, several considerations should be taken into account to enhance the research’s validity and applicability. First, increasing the sample size is crucial for improving the reliability of the study’s conclusions. Second, it is essential to conduct investigations across various periods, such as post-operation and post-discharge, to analyze the causes comprehensively and influencing factors of mental health issues in patients with KOA at different stages. This approach will enable medical professionals to develop targeted programs aimed at addressing the mental health challenges faced by KOA patients at each stage, thereby improving the overall quality of medical services. Third, incorporating imaging examinations for each participant can provide insights into the relationship between disease severity and the prevalence of anxiety and depression. Fourth, the conclusions drawn from observational studies could pave the way for future clinical trials, which would further investigate the efficacy of psychological interventions for KOA patients experiencing mood disorders. Finally, conducting multi-center research is recommended to facilitate comparisons of mental health levels among KOA patients in different regions. This comparison will offer readers a clearer understanding of the factors influencing anxiety and depression in this patient population.

In conclusion, factors such as age, BMI, QOL, subjective support, utilization of social support, and daily functioning significantly impact the mental health and QOL in patients with KOA. Therefore, to effectively manage patients with KOA, medical staff should optimize treatment plans by integrating clinical interventions aimed at alleviating symptoms and enhancing knee joint function. Additionally, establishing mechanisms for social support and positive psychological interventions is crucial to safeguarding elderly patients from depressive symptoms. By combining these approaches, the overall mental health and quality of life of KOA patients may be significantly improved.

Unfortunately, our study also has some limitations. Firstly, this study is a cross-sectional survey, which may have some recall bias and cannot provide direct causal evidence; thus, further experimental or longitudinal studies are necessary to facilitate an evaluation of causality. Secondly, the study was conducted at a single center. As a result, the findings are limited in scope and can only be generalized to the anxiety and depression experienced by KOA patients at this particular institution. Thirdly, the investigation was conducted prior to surgery, and no subsequent investigations or analyses were performed on KOA patients at various time points, such as postoperatively or at discharge. Fourthly, since some patients did not undergo an X-ray examination, the KL classification for KOA severity could not be determined for each patient. Consequently, this study did not analyze the relationship between disease severity and anxiety and depression. Finally, this study is observational, lacking any psychological interventions for KOA patients experiencing emotional disorders. Furthermore, no clinical trials were conducted to validate the accuracy of the conclusions or to assess the effectiveness of psychological interventions.

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