Two things may have happened - nerve
was severed or contused.
If it is just a contusion, the nerve will recover, but it will need to grow back - the growth rate is arround 1 mm every other day, or around an inch a month. You need to check where the damage was and then measure to see how long it will take to recover. If the nerve was severed, you will need surgery, so the nerve can be repaired.
For a better answer for your question, more information is needed. Find an orthopedic surgeon specialized in microsurgery, and he/she may be able to help you.