Dorsal dislocation of the fifth carpometacarpal joint

Isolated slipping dislocation in the ulnar direction of the fifth carpometacarpal joint—The utility of computed tomography

“…This isolated type of fifth CMC dislocation has been reported to occur in a dorsal or volar direction [1,2,5,10,11,[17][18][19], which may be easily overlooked under routine radiographs of an injured hand [7,15]. An isolated fifth CMC dislocation in the ulnar direction, as reported in the present case, is further uncommon and has not been well recognized [16].…”

Pure isolated dorsal dislocation of the fifth carpometacarpal joint

“…Further confusion is generated by the need for open reduction of the associated fracture and there is a shortage of studies comparing treatment methods. Both closed reduction with percutaneous pinning or open reduction with internal fixation are advocated [9][10][11][12][13].…”

Isolated Dorsal Dislocation of the 5th Carpometacarpal Joint

“…14,15 Dislocation of the 5th CMC joint usually results from a direct blow on the ulnar aspect of the head of the 5th metacarpal with the force being transmitted along the longitudinal axis in a dorsal to palmar direction. 4,9,[16][17][18][19][20][21] Isolated dislocation occurs when the bony resistance to fracture is greater than the support provided by the ligamentous structures. 4 Combined fracture of the 4th metacarpal and dislocation of the 5th metacarpal is plausibly due to an axial force transmitted along the 4th metacarpal.…”

“…1-3 An isolated dorsal dislocation of the 5th CMC is extremely rare. 4 Dislocation of the 5th CMC joint usually occurs in a Bennett's type fracture dislocation of the 5th metacarpal 1,5-9 or in association with other CMC dislocations. 4,[9][10][11][12][13] The ulnar two CMC joints have weaker ligamentous constraints, thus, isolated 5th CMC dislocation, combined 4th and 5th CMC dislocation and fracture dislocation occur more frequently than Hand Surg.…”