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Wrist

Basilar Thumb Arthritis

Anatomy

  • The CMC is a saddle joint between the trapezium and first metacarpal

Diagnosis

Eaton Stress View Xray

  • Assess laxity (hypermobility) of the thumb CMC joint
  • Positive if there is subluxation of the thumb metacarpal on the trapezium

Roberts View Xray

  • Shows trapeziometacarpal (aka CMC) joint degeneration, but not subluxation