Journal of shoulder and elbow surgery
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J Shoulder Elbow Surg · Oct 2013
Comparative StudyAcromioclavicular joint ligamentous system contributing to clavicular strut function: a cadaveric study.
We hypothesized that the clavicle overrides the acromion during certain shoulder motions for individuals with acromioclavicular (AC) joint separation producing clinical symptoms. We measured 3-dimensional clavicular and scapular motions in AC joint separation models during humerothoracic motions, which should be impacted by the loss of AC joint continuity. ⋯ Scapular and clavicular kinematics were affected in AC separation models. Abduction with humeral internal rotation resulted in a decrease in scapular posterior tilt and upward rotation in AC separation models, and thereby could lead to AC joint articulation dysfunction.