Osteochondroma of proximal end fibula causing common peroneal nerve compression: A rare case presentation

Osteochondroma is ectopic calcification in physeal plate causing a bony outgrowth with a cartilage cap. Osteochondroma grows till the growth plate is open. Osteochondroma constitutes 10% of all bone tumours and, among these, 35% (20–50%) of the benign tumours. The proximal fibula is rare site for an Osteochondroma causing a common peroneal nerve compression. We are presenting a case of a 12 year old male presented to us with the complaint of swelling over the lateral aspect of the left knee with decreased sensation of the dorsum and lateral border of the ipsilateral foot with weakness in dorsiflexion of ankle. X-ray showed bony out growth from the postero-lateral aspect of the fibula neck just beneath the physis. MRI showed bony out growth with a cartilaginous cap and the size of the lesion coincide with size as in x-ray. Marginal resection of the lesion was done along with exploration of the common peroneal nerve. The patient immediately postoperatively relieved from pain. A follow up of 3 months showed no tingling sensation and numbness over dorsum and lateral border of affected foot and power of dorsiflexion of ankle increased to 5/5.