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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.
A splint is often an ideal way to keep a dislocated thumb immobilized. A doctor will usually take an x-ray to determine the best treatment for a dislocated thumb. An ice pack, which can help with swelling from a dislocated thumb. Someone who has a dislocated thumb should avoid typing as much as possible. A medical doctor can determine whether a thumb is dislocated, sprained or broken.