On examination, he had extensor lags of 7° at the ring finger MCP joint and 10° at the small finger proximal interphalangeal (PIP) joint and limited small finger PIP joint flexion from 10° to 30°.

Stern: Patients with a Z deformity have flexion-adduction posture of the thumb metacarpal and compensatory hyperextension of the metacarpophalangeal (MCP) joint.

The thumb motions are flexion, extension, abduction, adduction, circumduction, opposition, rotation and apposition. All motions are customarily described as though the patient were erect, the arm ...

The flexor pollicis brevis flexes the metacarpophalangeal (MCP) joint of the thumb. The flexor digitorum profundus flexes the distal interphalangeal joints of digits 1 to 4, and the flexor ...

Another possible cause for your thumb pain may be MCP joint strain, which is described as pain, swelling or tenderness on either side of the MCP joint associated with loss of full flexion (ability ...