Patients who have the nerve-grafting operation may have another incision to get a nerve. This incision may be in their leg near their outer ankle. Removing this small nerve will cause the outer part of the foot to become numb forever. It does not cause any weakness in the foot, though. Risks of this part of the operation include, but are not limited to, bleeding, infection, and, in extremely rare cases, paralysis. When the nerve is taken from inside the pelvis then the patient may have numbness on the inner side of the thigh.