ArticleAnnals of biomedical engineering2026
Effect of Level of Posterosuperior Cuff Tear Severity on Joint Contact Mechanics in Reverse Total Shoulder Arthroplasty: A Simulation Study.
Article in Annals of biomedical engineering, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Anatomic versus reverse total shoulder replacement with an intact rotator cuff: a comparative musculoskeletal simulation study of glenohumeral joint biomechanics.Arthroplasty (London, England) · 2026Article
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Authors and funding
7 authors.
Funding
Abstract
purposeThe effects of different posterosuperior rotator cuff tear patterns, ranging from isolated supraspinatus tears to partial or complete infraspinatus involvement, on glenohumeral joint contact mechanics in reverse total shoulder arthroplasty (RTSA) remain unclear. This study aimed to investigate how varying levels of posterosuperior cuff tear (PCT) severity affect three-dimensional center-of-pressure (COP) trajectories, joint contact forces (JCFs), and muscle-tendon forces using a musculoskeletal shoulder model of RTSA.
methodsThree-dimensional marker trajectory data from eleven male participants were collected during 120° of shoulder abduction in the coronal plane and used as consistent inputs for the RTSA model. Model simulations were performed for various stages of PCT severity. For comparison with each stage of the model, an intact cuff model of RTSA was also simulated.
resultsAs PCTs progressed, the COP trajectories increasingly shifted in the superior (P < 0.001), anterior (P < 0.001), and medial (P < 0.001) directions. Additionally, the peak inferior and posterior JCFs decreased by 5.6% (P = 0.02) and 20.0% (P = 0.002), respectively (i.e., the contact area moved in a more anterosuperior direction). Conversely, preserving more posterosuperior cuffs increased muscle-tendon forces in the subscapularis and pectoralis major.
conclusionPreserving the middle-inferior infraspinatus can restore joint contact mechanics and mitigate increased muscle-tendon forces in RTSA. These findings can help orthopedic surgeons in deciding whether to repair the rotator cuff during RTSA to mitigate increased muscle-tendon forces and restore the transverse force couple between the anterior and posterior cuffs, thereby improving glenohumeral joint stability.
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