The nerve that is injured is common peroneal nerve. It winds around neck of fibula where it divides into superficial and deep peroneal nerves. Its injury causes: Motor loss: to dorsiflexers and eveors of foot causing " foot drop".sensory loss: is to the back of leg , lateral side if the leg and most of the dorsum of foot . aicular loss to lateral side of knee joint. Deep peroneal nerve divides into: Lateral terminal branch- supplies extensor digitorum brevis and tarsal joints Medial terminal branch- supplies skin adjoining 1 st web space of toe and proximal joints of big toe. Superficial peroneal nerve : Supplies skin over lower 1/3 of lat side of leg ,skin over entire dorsum of foot except lat border supplied by sural nerve , medial border upto base of great toe supplied by saphenous nerve cleft between 1 st and 2 nd toes supplied by deep peroneal nerve. Ref: BD Chaurasia ( 7 th edition pg 192)