Glenohumeral Ligaments, Posterior View

Description

Posteriorly, the scapula frames the glenohumeral articulation, with the spine of the scapula leading laterally to the acromion and the humeral head seated against the glenoid cavity. Capsular thickenings consistent with the glenohumeral ligaments are rendered within the joint capsule, spanning from the glenoid rim and adjacent labrum toward the anatomic neck of the humerus, draping inferiorly as they blend with the fibrous capsule. Along the superior aspect, the clavicle aligns with the acromion at the acromioclavicular region, while segments of the posterior rib cage sit medial and inferior to the scapular body. Cartilage caps the humeral head. Cleanly. Posterior shoulder instability is often discussed in terms of the posterior band of the inferior glenohumeral ligament complex and the posteroinferior capsule, structures that resist posterior translation when the arm is flexed, adducted, and internally rotated, the classic setup for posterior dislocation after a seizure or electrical injury. This viewpoint also clarifies how capsulolabral injury (posterior Bankart) differs from bony defects such as a reverse Hill-Sachs lesion on the anteromedial humeral head, distinctions that drive both imaging interpretation and operative planning. Sports medicine and orthopaedic surgery texts can pair this plate with arthroscopic correlation to orient readers to posterior portal trajectories and the relationship of capsular plication to the glenoid rim. Anatomy instructors will also find it effective for teaching why the shoulder trades constraint for range, using the capsule and its glenohumeral ligament thickenings as the main static stabilizers when the rotator cuff is fatigued. Anatomical accuracy verified by SciePro's Medical Advisory Board.