Abstract：
OBJECTIVE:After reverse shoulder arthroplasty (RSA) external and internal rotation will often remain restricted. A postoperative alteration of the biomechanics in the remaining cuff is discussed as a contributing factor to these functional deficits. METHODS:In this study, muscle moment arms as well as origin-to-insertion distance (OID) were calculated using three-dimensional models of the shoulder derived from CT scans of seven cadaveric specimens. RESULTS:Moment arms for humeral rotation are significantly smaller for the cranial segments of SSC and all segments of TMIN in abduction angles of 30 degrees and above (p ≤ 0.05). Abduction moment arms were significantly decreased for all segments (p ≤ 0.002). OID was significantly smaller for all muscles at the 15 degree position (p ≤ 0.005), apart from the cranial SSC segment. CONCLUSIONS:Reduced rotational moment arms in conjunction with the decrease of OID may be a possible explanation for the clinically observed impaired external and internal rotation.
journal_name
J Orthop Surg Resjournal_title
Journal of orthopaedic surgery and researchauthors
Herrmann S,König C,Heller M,Perka C,Greiner Sdoi
10.1186/1749-799X-6-42subject
Has Abstractpub_date
2011-08-16 00:00:00pages
42issn
1749-799Xpii
1749-799X-6-42journal_volume
6pub_type
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