Workers compensation lumbar radiculopathy drop foot or foot drop affects the foot but can come from a low back nerve injury. Weakness of the tibialis anterior muscle can cause the foot to drag when walking. The tibialis anterior picks the ankle up and pulls the foot toward the face. Most commonly, foot drop is caused by an injury to the peroneal nerve. The peroneal nerve is a branch of the sciatic nerve that wraps from the back of the knee to the front of the shin. Nerve impingement of the sciatic nerve as it leaves the low back can result in symptoms down in the peroneal nerve resulting in drop foot.