Extensor Tendon Dislocation at the Metacarpophalangeal Joint of Both Ring Fingers Caused by a Specific Hand Posture in a Shiatsu Therapist

Figure 1

(a) Shiatsu-specific hand posture. (b) When the metacarpophalangeal joint (MCPj) of the ring finger is flexed and deviated ulnarly with concurrent extension of the MCPj of the middle finger, the extensor tendon of the ring finger dislocates ulnarly (white arrowheads).