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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.
A dislocated finger occurs when the bones of a finger are moved out of their normal position because of the impact of the fingers against an object, person, ball, or piece of equipment. There are three joints in each finger (not counting the thumb). The middle joint is the one most frequently injured in athletes.