Peroneal nerve palsy caused by a synovial cyst of the proximal tibiofibular joint: A case report

Peroneal nerve entrapment is the most common entrapment found in the lower limb, even though nerve palsy caused by a synovial cyst of the proximal tibiofibular joint (PTFJ) is a very rare condition. We report the case of a 54-year-old man who developed sudden onset of an incomplete foot droop and therefore presented himself to the emergency room. Further examination showed a compression of the peroneal nerve provoked by a synovial cyst of the PTFJ. Treatment involved puncture of the cyst. The patient showed a complete and fast recovery. We discuss our case with regards to the recent literatures.