Subdeltoid Bursa

bursa subdeltoidea

The subdeltoid bursa is continuous with the subacromial bursa in approximately 80 percent of people, together forming the subacromial-subdeltoid bursal complex. Its distension is detectable clinically as lateral shoulder swelling and on ultrasound as bursal fluid lateral to the rotator cuff. Distinguishing subdeltoid from subacromial bursitis is largely academic given their frequent communication.

Region: Shoulder

Biomechanics

Function & Actions

Reduces friction between the deltoid and the underlying rotator cuff during arm elevation

Clinical Relevance

Clinical Notes

Subdeltoid bursal distension is often the first sign of a full-thickness rotator cuff tear on ultrasound, appearing as an anechoic fluid collection lateral to the greater tubercle. Calcific deposits rupturing into the subdeltoid bursa from the rotator cuff produce the acute calcific bursitis pattern of dramatic shoulder pain.

Pathology

Common Injuries & Conditions

Subdeltoid Bursitis

Lateral shoulder swelling and pain from the subdeltoid component of the subacromial-subdeltoid bursal complex, managed alongside subacromial pathology.