Reverse shoulder arthroplasty leads to significant biomechanical changes in the remaining rotator cuffReport as inadecuate




Reverse shoulder arthroplasty leads to significant biomechanical changes in the remaining rotator cuff - Download this document for free, or read online. Document in PDF available to download.

Journal of Orthopaedic Surgery and Research

, 6:42

First Online: 16 August 2011Received: 20 January 2011Accepted: 16 August 2011

Abstract

ObjectiveAfter 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.

MethodsIn 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.

ResultsMoment 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.

ConclusionsReduced rotational moment arms in conjunction with the decrease of OID may be a possible explanation for the clinically observed impaired external and internal rotation.

Keywordsshoulder arthroplasty cuff tear arthropathy reverse shoulder prosthesis biomechanics shoulder moment arms rotator cuff Electronic supplementary materialThe online version of this article doi:10.1186-1749-799X-6-42 contains supplementary material, which is available to authorized users.

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Author: Sebastian Herrmann - Christian König - Markus Heller - Carsten Perka - Stefan Greiner

Source: https://link.springer.com/







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