Doctors took a look at man's painful shoulder—they found the joint was missing

A construction worker, aged 45, sought emergency medical attention due to an intensely swollen and increasingly painful right shoulder. To determine the cause of his symptoms, doctors performed an X-ray. The results were startling: his entire shoulder joint had seemingly vanished, fractured into minute fragments. The shoulder joint comprises a ball-and-socket structure, where the humerus (upper arm bone) meets the scapula (shoulder blade).

Upon examination, the X-ray showed the absence of the humeral head and the socket. The humerus, detached from the joint, freely floated within the man's arm. Magnetic resonance imaging revealed that his rotator cuff—the muscles and tendons that secure the upper arm in the socket—was also severely damaged, with all four main tendons (supraspinatus, infraspinatus, and subscapularis) experiencing full-thickness tears.

This condition is known as "Milwaukee Shoulder Syndrome" or MSS, a rare and destructive ailment first identified in 1981 among elderly women in Wisconsin with severe joint damage and significant rotator cuff tears. Though the precise cause of MSS remains uncertain, doctors speculate that the deposition of calcium crystals (hydroxyapatite) may induce enzymes that attack joint tissues, leading to inflammation, swelling, and ultimately, complete joint destruction.

Treatment for MSS depends on early detection. Conservative measures such as anti-inflammatory medications and colchicine (a gout treatment) can be employed if caught early. However, severe cases, like the man's, often necessitate a full shoulder replacement. His medical team provided pain management and referred him for surgical evaluation.