Coracoacromial Ligament

Coracoacromial Ligament

The coracoacromial ligamentis a strong triangular band, extending between the coracoid process and the acromion, two bony projections on the scapula. It plays a crucial role in the stability and function of the shoulder joint.

Anatomy

The coracoacromial ligament is part of the shoulder complex and is located in the superior aspect of the shoulder. It forms the coracoacromial arch, which is an important structure that protects the head of the humerus and the rotator cuff tendons from direct trauma.

Origin and Insertion

The ligament originates from the lateral border of the coracoid process and extends laterally and slightly posteriorly to attach to the acromion, near its tip. This forms a protective arch over the shoulder joint.

Structure

The coracoacromial ligament is composed of dense fibrous connective tissue. It is relatively short and broad, and its triangular shape provides a strong support to the shoulder joint.

Function

The primary function of the coracoacromial ligament is to prevent superior displacement of the humeral head. It acts as a secondary stabilizer of the shoulder joint, especially when the arm is elevated. The ligament also serves as a barrier to prevent upward dislocation of the humeral head.

Clinical Significance

The coracoacromial ligament is often involved in shoulder impingement syndrome, a condition where the rotator cuff tendons are compressed under the coracoacromial arch during arm elevation. This can lead to pain and restricted movement. Surgical procedures, such as acromioplasty, may involve the resection of part of the coracoacromial ligament to relieve impingement.

Related Structures

The coracoacromial ligament is closely associated with other structures of the shoulder, including the acromioclavicular joint, the glenohumeral joint, and the rotator cuff.

Also see

• Shoulder joint
• Rotator cuff
• Acromioclavicular joint
• Glenohumeral joint
• Shoulder impingement syndrome

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