Finger dislocation is a common hand injury. Dislocations can occur at the proximal interphalangeal (PIP), distal interphalangeal (DIP), or metacarpophalangeal (MCP) joints. This article discusses the epidemiology, anatomy, examination, imaging, treatment, and complications of finger dislocations. The finger has three joints: the metacarpophalangeal (MCP) joint, the proximal interphalangeal (PIP) joint, and the distal interphalangeal (DIP) joint. The MCP joint is located between the metacarpal and the proximal phalanx. The PIP joint is a hinge joint between the proximal phalanx and the middle phalanx. The DIP joint is also a hinge joint, located between the middle phalanx and the distal phalanx. The range of motion at these joints allows for flexion and extension, providing the finger with gripping, pinching, and reaching capabilities. The range of motion of the PIP joint for the middle phalanx is 105 +/- 5 degrees, which accounts for most of the finger flexion during gripping. The fingers can also flex and extend at the metacarpophalangeal joint; however, the MCP joint can also perform adduction, abduction, and rotation.
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