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J Orthop Surg Res. 2011 Aug 16;6:42. doi: 10.1186/1749-799X-6-42.

Reverse shoulder arthroplasty leads to significant biomechanical changes in the remaining rotator cuff.

Author information

1
Center for Musculosceletal Surgery, Charité-Universitätsmedizin Berlin, Charitéplatz 1, D-10117 Berlin, Germany. sebastian.herrmann@charite.de

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.

PMID:
21846390
PMCID:
PMC3184075
DOI:
10.1186/1749-799X-6-42
[Indexed for MEDLINE]
Free PMC Article
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