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Dynamic Stability Factors

Glenohumeral stability is mainly achieved through dynamic factors. Active contraction of the rotator cuff contributes to joint stabilization by coordinated muscular activity and by secondary tightening of the ligamentous constraints. This effect works in combination with the concavity-compression mechanism, in which muscle contraction causes compression of nearly congruent articular surfaces into one another.

The rotator […]

Scapula

The scapula is a flat, triangular-shaped bone that serves as the articulating surface for the head of the humerus as well as provides areas for 17 muscle attachments. With the arm at the side, the scapula overlaps the dorsal surfaces of the second to seventh ribs. It has three prominent projections: the spine, the coracoid […]

Palpation of the subscapularis tendon

The subscapularis muscle belly can only be reached by bringing the hand in between the scapula and the thorax. It cannot really be palpated. The tendinous insertion on the lesser tuberosity, however, can easily be palpated. The subject is in a half lying position on a couch, the upper arm along the body and the […]

Palpation of soft tissue

Palpation of the deltoid muscle The deltoid muscle is easy to recognize. It forms the most important muscular mass of the shoulder and is responsible for its round look.The anterior portion overlies the anterior border of the acromion and the lesser tuberosity. The middle portion lies over the lateral border of the acramion and the […]

Tear and Inflammation of the Deltoid Muscle

Tears of the deltoid muscle, though infrequent, do occur in team handball and volleyball players, American footballers, weightlifters, wrestlers, and other athletes. The muscle is damaged in most cases by direct impact, but it can also be injured by overuse. The tear affects only a small part of the muscle, making it difficult to raise […]

Subacromial Bursitis

One large bursa in the shoulder is located between the supraspinatus muscle and the deltoid muscle and acromion process of the scapula. In its inflamed state the bursa is about the size of a golf ball. Inflammation of the bursa (subacromial bursitis) commonly occurs.

Causes

– A fall or blow to the shoulder or a […]