Foot drop results when muscles that move the foot up at the ankle joint are weak. These muscles are supplied by Lumbar 5 (L5) nerve root through the sciatic and its branch, the common peroneal nerve. It is a common cause for trip & fall injuries. Most often foot drop results from pressure on the common peroneal nerve against the fibula bone. However, precise localization needs NCV/EMG studies. For More Information: Foot drop
