The common fibular nerve, also known as the common peroneal nerve, is a branch of the sciatic nerve. It runs along the outer side of the leg and is responsible for providing sensation to the skin of the lower leg and the top of the foot. It also controls the muscles that lift the foot and toes, which is essential for walking and running. Injury to the common fibular nerve can lead to a condition called foot drop, where a person has difficulty lifting the front part of the foot. This can affect balance and mobility, making it important to seek medical attention if symptoms arise. Treatment may include physical therapy or, in some cases, surgery.