Dislocations and of the metacarpophalangeal (MCP) joint often show dorsal dislocation.
These dislocations are classified by the AO/OTA as 70E1.2–5[5], where 2–5 indicates the ray of the injured MCP joint.
An MCP dislocation may be associated with soft-tissue injuries and fractures of the metacarpal and/or proximal phalanx.
AP, oblique, and lateral views are required.
These AP and oblique x-rays show a case of a 2nd MCP joint dislocation with associated fracture of the metacarpal head.
Dorsal dislocation is readily seen in the lateral or oblique view.
In this case, the AP x-ray shows dislocation of the 2nd, 3rd, and 5th MCP joint.
The extent of dislocation is better visible in the lateral and oblique x-rays.
CT scans help evaluate the size, shape, and pattern of an associated fracture.
This lateral CT image shows the MCP joint dislocation and associated metacarpal head fracture.