ORIGINAL RESEARCH article
Front. Bioeng. Biotechnol.
Sec. Biomechanics
This article is part of the Research TopicInnovative Measurement Techniques in Tissue Biomechanics: From Cellular to Whole-Body ModelsView all 4 articles
3D modeling and fitted sphere analysis-based biotechniques unveil novel indicators and prognostic factors for subacromial impingement syndrome
Provisionally accepted
- 1The First Affiliated Hospital of Anhui Medical University, Hefei, China
- 2Fuyang Hospital Affiliated to Anhui Medical University, Fuyang, China
- 3No 2 People's Hospital of Fuyang City, Fuyang, China
- 4First Affiliated Hospital of Anhui Medical University, Hefei, China
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Objective: To investigate the impact and diagnostic value of novel indicators based on 3D modeling and fitted sphere analysis for Subacromial Impingement Syndrome (SIS). Methods: CT data from patients with SIS and healthy individuals were imported into a software system to reconstruct a 3D model of the index shoulder. The following parameters were measured: humeral head-pseudo-moving domain volume index, pseudo-moving domain anteversion angle, pseudo-moving domain abduction angle, Critical Shoulder Angle (CSA), Acromion Index (AI), Acromio-humeral Interval (AHI), Lateral Acromial Angle (LAA), Acromion-Greater Tuberosity Impingement Index (ATI), glenoid inclination angle, and glenoid ante/retroversion angle. Influencing factor analysis, Receiver Operating Characteristic (ROC) curve analysis, and correlation analysis were then performed. Results: The humeral head-pseudo-moving domain volume index, pseudo-moving domain anteversion angle, and pseudo-moving domain abduction angle were all indicators for SIS (P < 0.05). The humeral head-pseudo-moving domain volume index had high accuracy in predicting SIS (AUC=0.778, P < 0.001), with an optimal threshold of 0.690, at which sensitivity and specificity were 67.0% and 77.0%, respectively. The pseudo-moving domain anteversion angle had no diagnostic value. The pseudo-moving domain abduction angle had high accuracy in predicting SIS (AUC=0.728, P < 0.001), with an optimal threshold of 75.012, at which sensitivity and specificity were 62.2% and 72.8%, respectively. When the new indicators were used in combination, the accuracy was higher (AUC=0.859, P < 0.001), with optimal thresholds of 0.528 or 0.542. The humeral head-pseudo-moving domain volume index had correlation with AI, AHI, LAA, and ATI. The pseudo-moving domain anteversion angle showed no correlation with glenoid anteversion/retroversion. The pseudo-moving domain abduction angle had correlation with critical shoulder angle and glenoid superior inclination. Conclusion: The new indicators based on 3D modeling and fitted sphere analysis are indicators for SIS. The humeral head-pseudo-moving domain volume index and pseudo-moving domain abduction angle have prognostic value for SIS.
Keywords: Shoulder Impingement Syndrome, 3D modeling, fitted sphere, pseudo-moving domain, prognosis
Received: 23 Sep 2025; Accepted: 08 Dec 2025.
Copyright: © 2025 Yang, Liu, Wang, Zhang, Guo, Wei and Hu. 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) or licensor 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: Yong Hu
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