Sonopathology of the sternoclavicular joint

Osteoarthritis of the sternoclavicular (SC) joint, with capsular thickening, is the most common abnormality affecting the SC joint. Musculoskeletal ultrasound (MSKUS) examination reveals marginal osteophytes, capsular thickening, and joint-space narrowing.

The SC joint is an uncommon site for septic arthritis, accounting for only 1% of all joint infections, although it accounts for 17% of septic joint infections in intravenous-drug abusers. MSKUS examination reveals inflammation of the adjacent soft tissue, joint effusion, and sometimes periarticular abscess formation. Osteomyelitis of the chest wall is an uncommon but potentially life-threatening sequela.

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