Probably not: If the back of the finger is numb you probably injured a sensory nerve on the back of the finger. These nerves are not fixable. See a hand surgeon to make sure nothing else is wrong.
Answered 9/23/2016
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Yes: You may have injured a nerve. Nerve injuries can be repaired with surgery. Usually a period of time is required to see if the nerve function returns . If it does not then surgery would be requiered to return the feeling to your hand. If the loss of feeling doesn't interfer with function you may elect to not have the nerve repaired. Some of the numb area will be improved by the surrounding nerves.
Answered 11/9/2012
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