ArticleJournal of shoulder and elbow arthroplasty2026
Sex-associated differences in deltoid and rotator cuff muscle elongation after reverse shoulder arthroplasty.
Article in Journal of shoulder and elbow arthroplasty, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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6 authors.
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Abstract
Background: Advancements in pre-operative planning and implant design have improved the ability to tailor reverse total shoulder arthroplasty (rTSA) to patient anatomy. Post-operative changes in deltoid and rotator cuff muscle length are important for function and stability and may vary based on implant configuration and patient-specific factors; however, the influence of sex on these muscle length changes remains poorly defined. The purpose of this study was to evaluate sex-based differences in implant selection and muscle length changes following rTSA and to determine whether these differences persist after accounting for anatomic and implant-related variables. Methods: A retrospective analysis of 507 patients (233 males, 274 females) who underwent computed tomography-based pre-operative planning for rTSA using the INHANCE Reverse Shoulder System (DePuy Synthes) was performed. Standardized 3-dimensional scapular coordinates were used to measure glenoid and scapular morphology. Percent elongation of the deltoid, infraspinatus, teres minor, and subscapularis was calculated between native and planned states. Implant characteristics, including glenosphere size, lateralization, and eccentricity, were recorded. Sex-based differences in anatomy, implant selection, and muscle elongation were evaluated with Results: Males demonstrated significantly larger scapular and glenoid dimensions and were more likely to receive larger and more lateralized glenosphere configurations ( Conclusion: Muscle length changes following rTSA vary based on both implant configuration and patient-specific factors, with distinct sex-based differences in posterior rotator cuff response. While deltoid elongation is primarily influenced by implant selection, posterior cuff muscle changes appear to be independently associated with sex. These findings highlight the importance of considering patient-specific anatomy when planning rTSA and may help guide implant selection and soft tissue tensioning strategies.
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