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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.
1 However, if you have severe symptoms of pain, numbness, weakness, swelling, or bruising of your finger, see your doctor right away.  A jammed finger usually involves damage to the ligaments surrounding the finger joints and reduced movement in the affected joint due to compaction.