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MCP JOINT. The metacarpophalangeal (MCP) joint most commonly dislocated is that of the thumb. A simple dislocation involves no soft tissue obstruction, and reduction should be attempted. A complex dislocation involves intervening soft tissue (i.e., ligaments, musculature, or fascia) and requires surgical reduction.CP JOINT. The metacarpophalangeal (MCP) joint most commonly dislocated is that of the thumb. A simple dislocation involves no soft tissue obstruction, and reduction should be attempted. A complex dislocation involves intervening soft tissue (i.e., ligaments, musculature, or fascia) and requires surgical reduction.
Indications for reduction of a thumb dislocation include the following: 1  Radiographic evidence of dorsal dislocation of the first MCP or IP joint with no simultaneous radiographic evidence of intra-articular fracture of the carpals, the first metacarpal, or the first proximal or distal phalanx.