Coracoacromial ligament

The primary function of the coracoacromial ligament is to enhance the stability of the shoulder by limiting excessive upward displacement of the humeral head during arm activities. This stability is essential, as it helps to prevent dislocation and injuries that can occur during dynamic movements that require shoulder rotation and lifting. Additionally, it acts as a protective barrier for the underlying structures such as the rotator cuff tendons and the subacromial bursa, preserving mobility and reducing the risk of impingement syndrome. By maintaining a proper alignment of the scapula and the humerus during various arm functions, this ligament supports efficient motor performance and reduces the metabolic energy required for shoulder movements.

The coracoacromial ligament is located in the shoulder region, specifically connecting the coracoid process, which is a small hook-like projection on the lateral aspect of the scapula, to the acromion, the bony prominence at the top of the shoulder blade. It forms part of the coracoacromial arch, which encompasses the upper shoulder joint and contributes to the overall stability of the shoulder girdle. The ligament lies superior to the glenohumeral joint and spans across the top of the humeral head, making its location critical for protecting the shoulder during motion.

• The coracoacromial ligament is often involved in shoulder injuries and conditions such as rotator cuff tears.
• Despite its supportive role, overuse or trauma can lead to inflammation of the ligament, contributing to shoulder pain.
• The term 'impingement syndrome' often refers to conditions involving the space beneath the coracoacromial arch, where the ligament is located.