Scapular and humeral elevation coordination patterns used before vs. after Reverse Total Shoulder Arthroplasty

The purpose of this study was to compare scapulohumeral coordination used before and after Reverse Total Shoulder Arthroplasty (RTSA) during the ascent phase of scapular plane arm elevation tasks performed with varied shoulder rotations (neutral, external rotation, and internal rotation). We expecte...

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Bibliographic Details
Published in:Journal of biomechanics 2021-08, Vol.125, p.110550-110550, Article 110550
Main Authors: Zaferiou, Antonia M., Knowlton, Christopher B., Jang, Suk-Hwan, Saltzman, Bryan M., Verma, Nikhil N., Forsythe, Brian, Nicholson, Gregory P., Romeo, Anthony A.
Format: Article
Language:English
Subjects:
Arthroplasty
Biomechanics
Calibration
Coordination
Humerus
Joint replacement surgery
Joint surgery
Kinematics
Motion capture
Pain
Reverse Scapula
Rhythm
Rotation
Rotator cuff
Scapula
Scapulohumeral Rhythm
Shoulder
Thorax
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Summary:The purpose of this study was to compare scapulohumeral coordination used before and after Reverse Total Shoulder Arthroplasty (RTSA) during the ascent phase of scapular plane arm elevation tasks performed with varied shoulder rotations (neutral, external rotation, and internal rotation). We expected that after RTSA, participants would decrease scapulothoracic upward rotation angular displacement and increase the scapulohumeral rhythm (SHR) vs. before RTSA. 11 RTSA patients (12 shoulders) participated in this study before and after RTSA while optical motion capture measured kinematics of the humerus and scapula relative to the thorax. Angular kinematics were compared pre vs. post-RTSA within-participant using One Dimensional Statistical Parametric Mapping (SPM) t-tests (α = 0.05) and across-participants, using paired t-tests (α = 0.05) adjusted for multiple comparisons. As a group, during arm elevation with neutral rotation, the mean (SD) SHR pre-RTSA was 1.5 (0.5) and increased to 1.7 (0.3) post-RTSA, though, not significantly (p = 0.182). In contrast, during arm elevation with external rotation, the mean (SD) SHR pre-RTSA was 1.3 (0.4) and significantly increased (p = 0.018) post-RTSA to 1.7 (0.3). Likewise, during arm elevation with internal rotation, the mean (SD) SHR pre-RTSA was 1.2 (0.3) and significantly increased (p 
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2021.110550