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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.
When metacarpophalangeal dislocations do occur, they are usually dislocations of either the index finger or little finger (pinky). Symptoms. A dislocated finger is crooked, painful and swollen, and its surface skin may be cut, scraped or bruised. If a dislocated finger has been straightened on the playing field, it may feel abnormally loose, weak or unstable afterward. Diagnosis. Your doctor will suspect that your finger is dislocated if it appears deformed.