The "zero-position" of the shoulder joint described by Saha (1961) is recognized as a mechanical position between scapula and humerus, and the "scapular plane" is widely accepted as a mechanical plane at the shoulder joint. On the basis of biomechanical concepts of the "zero-position" and the "scapular plane", the authors designed the "zero-position" functional shoulder orthosis. This orthosis ...

STUDY DESIGN Cross-sectional. OBJECTIVES To compare sternoclavicular, acromioclavicular, and scapulothoracic joint motion between symptomatic and asymptomatic individuals during shoulder motion performed in 3 planes of humerothoracic elevation. BACKGROUND Differences in scapulothoracic kinematics are associated with shoulder pain. Several studies have measured these differences using surfac...

PURPOSE To determine whether transfer to only the anterior branch of the axillary nerve will restore useful function after axillary nerve injury with persistent posterior deltoid and teres minor paralysis. METHODS We used a computational musculoskeletal model of the upper limb to determine the relative contributions of posterior deltoid and teres minor to maximum joint moment generated during...

This study aimed at investigating the influence of three rackets on shoulder net joint moments, power and muscle activity during the flat tennis serve under field- conditions. A 6-camera Eagle(®) motion analysis system, operating at 256 Hz, captured racket and dominant upper limb kinematics of the serve in five tennis players under three racket conditions (A: low mass, high balance and polar mo...

Hospital for Special Surgery COMMONLY MISSED DIAGNOSES OF THE SHOULDER WITH MRI 1. Early glenohumeral osteoarthritis a. Etiologies b. Sites c. Differentiation from osteochondral defect, glenoid bare area [1] Brophy RH, Marx RG. Osteoarthritis following shoulder instability. Clin Sports Med 2005(24);47-56. [2] Patzer T, Lichtenberg S, Kircher J, et al. Influence of SLAP lesions on chondral lesio...

BACKGROUND Shoulder instability is a common problem affecting young adults. Stabilization surgery followed by physiotherapy rehabilitation has been shown to reduce the chance of further episodes of shoulder dislocation and to improve quality of life in patients who sustain a shoulder dislocation as a result of a high collision trauma, but it is unclear if surgical intervention is beneficial for...

The term ‘‘floating shoulder ’’ was introduced by Herscovici in 1992 [1], charactered by ipsilateral scapular neck and clavicular shaft fractures. The definition of ‘floating shoulder’’ has been criticized by many authors, and the widely accepted definition is a double disruption of the superior suspensory shoulder complex (SSSC) [2-5]. SSSC is a bony/soft tissue structure, playing important ro...

A cadaver model was used to test the hypothesis that glenohumeral joint stability is independent of articular surface conformity after total shoulder arthroplasty. For the purposes of this study joint stability was defined as the minimum force required for joint dislocation. After arthroplasty components were implanted into fresh-frozen glenohumeral joints, specimens were mounted on a load fram...