The coracoacromial ligament spans between the coracoid process and acromion, forming the roof of the subacromial space through which the rotator cuff tendons pass, limiting superior humeral head migration.
Forms the coracoacromial arch that prevents complete superior dislocation of the humeral head while also contributing to subacromial narrowing in impingement.
In shoulder impingement surgery, the coracoacromial ligament is partially or completely released during acromioplasty to widen the subacromial space. Its role as a passive restraint means complete excision increases risk of anterosuperior escape of the humeral head.
Compression of the rotator cuff and bursa between the humeral head and coracoacromial arch during arm elevation, producing a painful arc of abduction managed with physiotherapy and injection before considering surgical decompression.
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