Anterior Perspective of the Common Peroneal Nerve

Description

Running distally from the posterior thigh into the popliteal fossa, the sciatic nerve is shown dividing into the tibial nerve and the common fibular (peroneal) nerve, the latter tracking laterally along the biceps femoris tendon toward the head and neck of the fibula. From an anterior perspective, the common peroneal nerve wraps around the proximal fibula at the lateral aspect of the knee, then continues into the anterolateral compartment as the superficial and deep fibular nerves. The tibia lies medial to the fibula, and the patella anchors the anterior knee while the tarsals, metatarsals, and phalanges extend distally in line with the leg’s long axis. This lateral turn around the fibular neck is the nerve’s predictable choke point. Entrapment or injury at this site, after fibular head fracture, tight plaster cast, habitual leg crossing, or prolonged lithotomy positioning, produces acute foot drop with weak ankle dorsiflexion (deep fibular nerve, tibialis anterior) and variable loss of eversion (superficial fibular nerve, fibularis longus and brevis), plus sensory change over the dorsum of the foot and the first dorsal web space. The anterior orientation also clarifies its relationship to the knee joint line and to surgical landmarks used during lateral approaches to the proximal tibia and fibula. Orthopaedic teaching on knee trauma, peripheral nerve injury, and compartment syndromes will benefit from this layout, as will surgical atlases describing fibular head exposure, nerve decompression, or tendon transfer planning for peroneal palsy. It also suits patient education materials explaining why a proximal leg injury can present with distal dorsiflexion weakness and dorsal foot numbness. Anatomical accuracy verified by SciePro's Medical Advisory Board.