trapezoid

Definition

OA of the scapho-trapezium-trapezoidal joints

Epidemiology

50% patients with CMC OA have STT OA

F > M

Xray

Management

Anatomy

Synovial joint with hyaline cartilage

Has fibrocartilage intra-articular disc

- complete or incomplete

- usually degeneration by 4th decade

Clavicle may lie superior to acromion in normal population

Acromioclavicular Ligaments