Milwaukee shoulder, or destructive shoulder arthropathy, usually affects elderly women, associated with the deposition of hydroxyapatite crystals, with joint effusion and rotator cuff tear.

The findings, in this case, are consistent with Milwaukee shoulder caught at quite an early stage, as there is no evident destruction of the articular surfaces of the glenohumeral joint and no narrowing of the subacromial space as a sign of complete supraspinatus tendon tear. Substantial glenohumeral joint narrowing can either be attributed to destructive arthropathy or to osteoarthritis. The main differential diagnosis for the linear calcifications is chondrocalcinosis from calcium pyrophosphate deposition disease (CPPD), where they tend to be more uniform and extensive.

Case courtesy of Prof Fabio Denicolò.