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.
| Location | Between the deltoid muscle and the rotator cuff tendons, communicating with the subacromial bursa in most people |
|---|---|
| Nearby |
|
Reduces friction between the deltoid and the underlying rotator cuff during arm elevation
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 in the supraspinatus can rupture into the subdeltoid bursa, producing acute calcific bursitis: very severe lateral shoulder pain, with the patient holding the arm rigidly against the body. Ultrasound-guided needling and lavage of the calcium deposit (barbotage) gives rapid relief.
Lateral shoulder swelling and pain from the subdeltoid component of the subacromial-subdeltoid bursal complex, managed alongside subacromial pathology.
Rupture of a supraspinatus calcium deposit into the subdeltoid bursa producing hyperacute shoulder pain, managed with ultrasound-guided needling and lavage.
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