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- Title
In vivo three-dimensional motion analysis of the shoulder joint during internal and external rotation.
- Authors
Koishi, Hayato; Goto, Akira; Tanaka, Makoto; Omori, Yasushi; Futai, Kazuma; Yoshikawa, Hideki; Sugamoto, Kazuomi
- Abstract
Purpose: The purpose of this study was to assess accurately the three-dimensional movements of the scapula and humerus relative to the thorax during internal/external rotation motion with abduction of the shoulder joint. Methods: Ten right shoulders of ten healthy volunteers were examined using a wide-gantry open magnetic resonance imaging (MRI) system. MRI was performed every 30° from 90° external rotation to 90° internal rotation of the shoulder joint. Results: The contribution ratio of the scapulothoracic joint was 12.5% about the long axis of the humerus during internal/external rotation motion. With arm position changes from 90° external rotation to 60° internal rotation, most movement was performed by the glenohumeral joint. Conversely, at internal rotation of ≥60°, the scapula began to markedly tilt in the anterior direction. At 90° internal rotation, the scapula was significantly tilted anteriorly ( p < 0.05) when compared with the other positions. Conclusions: We clarified the existence of a specific scapulohumeral motion pattern, whereby the glenohumeral joint moves with internal rotation and the scapulothoracic joint moves with anterior tilt together with internal rotation motion of the shoulder joint.
- Subjects
SHOULDER joint; SCAPULA; HUMERUS; MAGNETIC resonance imaging; SHOULDER
- Publication
International Orthopaedics, 2011, Vol 35, Issue 10, p1503
- ISSN
0341-2695
- Publication type
Article
- DOI
10.1007/s00264-011-1219-5