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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.
Trauma or injury to the thumb such as a sprain or fracture can lead to pain and limited function. A âjammedâ thumb refers to a sprain of the ligaments surrounding the joint. In extreme cases, disruption of these ligaments can lead to instability of the joint. Overuse of the thumb is another source of thumb pain.