Glenohumeral ligaments

Diagram of the shoulder joint, showing the glenohumeral ligaments.

The glenohumeral ligaments are a group of ligaments located in the shoulder joint, specifically connecting the glenoid cavity of the scapula to the humerus. These ligaments play a crucial role in stabilizing the shoulder joint, which is one of the most mobile joints in the human body.

Anatomy

The glenohumeral ligaments are composed of three distinct bands:

• Superior Glenohumeral Ligament (SGHL): This ligament originates from the upper part of the glenoid cavity and inserts into the lesser tubercle of the humerus. It helps to limit external rotation and inferior translation of the humeral head when the arm is at the side.

• Middle Glenohumeral Ligament (MGHL): The middle glenohumeral ligament arises from the anterior aspect of the glenoid cavity and attaches to the anterior aspect of the humerus. It provides anterior stability to the shoulder joint, particularly when the arm is abducted.

• Inferior Glenohumeral Ligament (IGHL): This is the most important of the three ligaments for shoulder stability. It consists of an anterior band, a posterior band, and an axillary pouch. The IGHL complex is crucial in preventing anterior and posterior dislocations of the shoulder.

Function

The primary function of the glenohumeral ligaments is to stabilize the shoulder joint by limiting excessive movement. They work in conjunction with the rotator cuff muscles and the labrum to maintain the humeral head within the glenoid cavity during various arm movements.

Clinical Significance

Injuries to the glenohumeral ligaments can lead to shoulder instability, which may manifest as dislocations or subluxations. Such injuries are common in athletes who engage in overhead activities, such as baseball pitchers or swimmers.

Shoulder Dislocation: Anterior dislocation is the most common type of shoulder dislocation and often involves damage to the inferior glenohumeral ligament.

Bankart Lesion: This is a specific injury to the anterior part of the glenoid labrum and is often associated with tears of the inferior glenohumeral ligament.

Related Pages

• Shoulder joint
• Rotator cuff
• Labrum (shoulder)
• Shoulder dislocation