The temporary loss of sensation and function in your hand is called neuropraxia, which may result from either a direct trauma or from compression of a peripheral nerve against the bones in the hand. Damage to the ulnar nerve may result in a loss of strength of the fourth and fifth fingers. A characteristic of this type of injury is benediction or bishop’s deformity, in which the ring and little finger are in a flexed position and can’t be extended. You should see a doctor to determine the exact nature of the injury as well as the proper course of treatment.
(This answer provided for NATA by the Indiana University Athletic Training Education Program)