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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.
Dislocated Thumb. A dislocated Thumb is the medical term used when the ligaments of the thumb (1st phalange) have been injured by being overstretched or torn to the extent that the two connecting bones have become dislodged and are no longer aligned as they should be. The hand itself is made of 3 sections of different bones.