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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 broken or dislocated jaw is an injury to the joints that join the lower jawbone to the skull. These joints, called the temporomandibular joints, can break, crack, or become âunhingedâ from the skull. The unhinging of the jaw joints is referred to as a dislocation.xperiencing a facial injury is the primary cause of a broken or dislocated jaw. The jawbone extends from your chin to behind your ear. Common types of injury that can cause fractures or dislocations in the jawbone are: 1  physical assault in the face. 2  sports injuries. 3  vehicle accidents.