Synovial chondromatosis is an uncommon condition, and involvement of the shoulder is even more rare. We report on a 39-year-old female who presented with symptoms, radiographic features, and intraoperative findings consistent with multiple subacromial loose bodies resulting in a partial-thickness, bursal-sided rotator cuff tear of the supraspinatus muscle. She was treated with an arthroscopic r...

OBJECTIVE To evaluate cell cultures derived from intrasynovial nodules from a patient with primary synovial chondromatosis (PSC) for aberrant numbers/differentiation of osteochondroprogenitor cells. METHODS Cell cultures were established from PSC synovial nodules, or normal bovine or human osteoarthritis (OA) synovia (for comparison). Multi-lineage potential was determined using well-characte...

Synovial chondromatosis is a benign idiopathic metaplasia of the synovial membrane. It affects one in 100000 persons. It is 3 times more common in males, arising between 30 and 50 years of age and mainly affects large joints such as the knees (70%), hips (20%) and shoulders (19%). Its etiology is unknown, although it has been associated with chromosomal mutations (p21.3 and 12q13) that affect p...