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Principles

Biomechanical considerations

The range of movement of a joint is normally limited by the articular surfaces, the ligaments, and the joint capsule, and by the length and flexibility of muscles and tendons. The ligaments and joint capsule are comparatively inelastic and are responsible for maintaining passive stability, while muscles and tendons control active stability.Muscles, tendons, […]

Injury of the Subscapularis Tendon

Injury of the subscapularis tendon

The subscapularis muscle (which originates on the inner surface of the scapula, runs anterior to the shoulder joint, and is inserted high into the anterior aspect of the head of the humerus) is the most important internal rotator of the upper arm. Its tendon can be affected by partial or […]