Posterior talus osteochondroma a rare location, treated by posterior ankle arthroscopy

•Posterior talus osteochondroma is a rare lesion.•Proper imaging can define the lesion in a better way.•Posterior ankle arthroscopy provides complete access.•Total excision can be achieved through minimal access.

The common cause of posterior ankle impingement syndrome is impingement of the Os trigonum or the posterior talar process. We report a case of a 46-year-old lady having osteochondroma of the posterior talar process, a rare occurrence at this site. This patient was treated with posterior ankle arthroscopic excision through the 2-portal posterior ankle arthroscopy technique in the prone position. 6 months post-operatively, her ankle pain disappeared and ankle range of movement improved significantly and there is no recurrence of the tumour.