![]() ![]() ![]() CMC dislocations associated with fifth or other metacarpal fracture or hamate fractures are more frequent than pure dislocations. Dorsal dislocations of the CMC joints are relatively more frequent as compared to volar, affecting commonly the fourth and fifth fingers. There is a high degree of variation with dorsal, multiple palmar, and two sets of interosseous ligaments (only one between the long and ring metacarpals) furthermore, the ECU tendon inserts on the fifth metacarpal base. Stability at the finger CMC joints is provided by a system of four ligaments. This injury has been recognized to be of two types depending on dorsal or volar displacement, which may be easily missed on routine radiographs in a trauma patient. At last follow-up, the patient was doing all routine activities with normal grip strength and full range of motion at wrist without pain.Īn isolated pure dislocation of fifth CMC joint is a relatively rare injury first reported by McWhorter in 1918. 2a and andb), b), an ulnar gutter pop slab was applied for 4-6 weeks. Immediate closed reduction was done in emergency room by applying longitudinal traction and direct pressure on metacarpal base dorsally, reduction was stable and confirmed by postreduction radiographs ( Fig. A diagnosis of isolated dislocation of fifth CMC dislocation was made based on radiographs. Standard radiographs were obtained which revealed isolated pure dislocation of the fifth CMC joint without any other associated injury or fracture of other metacarpals or wrist ( Fig. There was a mild swelling at fifth CMC joint region and a bony prominence was felt dorsally, little finger presented an abduction deformity, and there was apparent shortening of the fifth ray. A 21-year-old male presented to the Emergency Department with severe pain on right carpus following a fall with injury to the right hand. ![]()
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