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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.
What is a skierâs thumb?Skierâs thumbâ is a commonly used name for specific injury occurring to the thumb. A skierâs thumb is an acute injury of the ulnar collateral ligament (UCL) of the thumb metacarpophalangeal (MCP) joint. This often occurs from a sudden, forceful deviation of the thumb, such as when the thumb is bent away (abducted) from the hand. If this force is great enough, a ligament which provides stability to the thumb can be torn. This injury is referred to as a âskierâs thumbâ given the frequency it occurs on the ski slopes. It may occur during a fall while holding a ski pole as the handle suddenly forces the thumb away from the hand.