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Metacarpophalangeal Joints (MCP) (MPJ)

  • Metacarpal head is biconvex, cam-shaped so it extends further volarly than dorsally and is wider volarly than dorsally
  • Soft tissue restraints limit motion to flexion/extension and adduction/abduction
  • Adduction and abduction point of reference is the middle finger and the middle finger either radially or ulnarly deviates
  • Axial rotation is permitted only passively