Imaging sternoclavicular joint

Freely mobile ball-and-socket synovial joint
Participates in all movements of upper extremity
Only 50% of medial end of clavicle articulates with manubrium
Has dense fibrous capsule
Supporting ligaments are interclavicular ligament, anterior and posterior sternoclavicular ligaments, costoclavicular ligaments.

Best seen on oblique coronal images
Narrowing of joint space, capsular hypertrophy, osteophyte formation

Sternoclavicular joint injury

Aslam et al. MRI of sternum and sternoclavicular joint. BJR 75 (2002). 627-634