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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.
With severe dislocations, there can be numbness or tingling. The injured finger can appear a pale color. The dislocation may cause a break in the skin where the injury has occurred. If this occurs, the injured person should seek medical attention immediately. The dislocation may be accompanied by a break in the bone and will require prompt medical attention.