A 43-year-old man sustains a fracture of the tibia. There are no neurologic or muscular lesions noted on careful examination. An above-knee cast is applied. After 6 weeks, the plaster is removed. It is noted that he has a foot drop and is unable to extend his ankle because of pressure injury to which of the following?
Posterior tibial nerve Saphenous nerve Femoral nerve Deep fibula (peroneal) nerve