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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.
Mallet fracture dislocation is most common type of thumb dislocation. Pure IP dislocation with out a fracture is a rare injury. It is caused by a fall on the thumb. The skin can be torn and bone exposed.These dislocations are usually towards the dorsal (finger nail) surface.In pure IP dislocations the thumb remains extended and there is inability to flex the joint.allet fracture dislocation is most common type of thumb dislocation. Pure IP dislocation with out a fracture is a rare injury. It is caused by a fall on the thumb. The skin can be torn and bone exposed.