[The function of passive stabilizers of the glenohumeral joint--a biomechanical study].

Unlabelled: In a biomechanical study we evaluated the passive stabilizing ligaments of 9 fresh shoulder specimens with mercury bands. While preparing the specimens we found two interesting entities: there are fibers of the coracohumeral ligament running from the humeral head to the coracoacromial ligament and there was an reproducible thickening in the posterior joint capsule. Functional evaluation shows that the coracohumeral ligament limits external rotation independently of the amount of abduction as well as inferior subluxation.

[Etiology of sub-acromial impingement syndrome--a biomechanical study].

Eight fresh shoulder specimen were dissected and the functional relationship of the rotator cuff tendons to the acromion was demonstrated through various arcs of shoulder motion. The scapula was fixed and the arm was elevated, rotated, and abducted by pulling the muscle tendon according to EMG activities. Using FUJI compression films the subacromial compression of the rotator cuff was measured.