Scapulohuméral

Scapulohuméral refers to the region of the body where the scapula, or shoulder blade, articulates with the humerus, the upper arm bone. This articulation forms the glenohumeral joint, the primary joint of the shoulder. This complex joint allows for a wide range of motion, including flexion, extension, abduction, adduction, internal rotation, and external rotation, making it one of the most mobile joints in the human body.

The stability of the scapulohumeral joint is provided by a combination of the bony structure, the glenoid labrum, and the rotator cuff muscles. The glenoid cavity, a shallow socket on the scapula, is deepened by the labrum, which helps to increase stability. The rotator cuff, a group of four muscles (supraspinatus, infraspinatus, teres minor, and subscapularis), surrounds the joint and provides dynamic stability through their constant action to keep the humeral head centered within the glenoid.

Scapulohumeral rhythm describes the coordinated movement of the scapula and the humerus during arm elevation. For proper and efficient arm movement, the scapula must rotate upwards as the humerus abducts or flexes. Disruptions in this rhythm can lead to pain, reduced range of motion, and an increased risk of injury. Conditions affecting this area can include rotator cuff tears, impingement syndrome, and frozen shoulder.