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Finger dislocation, also called a finger jam, is a common injury. It occurs when the bones of the finger are moved (dislocated) from their normal position. A dislocated finger can occur in any of the joints of any finger, but it occurs most often in the middle knuckle of the little, ring, middle, or index finger.
Dislocations are described as dorsal, volar, or lateral depending on the direction of the middle phalanx to the proximal phalanx. A dorsal PIP dislocation is the most common type of finger dislocation. It usually involves injury to the volar plate and may include a volar plate avulsion fracture. A dorsal PIP dislocation often leads to obvious dorsal deformity of the middle phalanx and volar plate tenderness.