Entrapment of the Common Peroneal Nerve due to Multiple Hereditary Exostoses with Synostosis of the Proximal Tibiofibular Joint

Abstract

A 37-year-old male presented with progredient weakness of dorsiflexion in his left ankle since 5 months that was accompanied with sensory deficits in the superficial peroneal nerve area at the dorsal aspect of his left foot. Additionally, the patient reported increasing pain around his left Proximal Tibiofibular Joint (PTFJ). There was a history of known Multiple Hereditary Exostoses (MHE) that was primarily diagnosed with patient's age of 8 years. The Postero-Anterior (PA) radiograph of lower leg showed multiple exostoses around his left tibial head that was accompanied with distinctive synostosis of the PTFJ; and, additionally, a distinctive synostosis of the distal tibiofibular joint was present as well (Figure 1A).