L4, L5, S1), trauma to the sciatic nerve, spondylolisthesis, spinal stenosis, spinal cord injury, bone fractures
(leg, vertebrae), stroke, tumor, diabetes
, lacerations, gunshot wounds, or crush-type injuries. Drop foot is found in some patients with Amyotrophic Lateral Sclerosis (ALS), Multiple Sclerosis (MS), and Parkinson's Disease. Sometimes the peroneal nerve becomes injured when stretched during hip or knee replacement surgery.