A 66-year-old man fell 14 steps and was subsequently unable to bear weight due to pain in the ankle. The foot was swollen and deformed, but radiographs showed no ankle fracture. Clinical findings and a radiograph that “just didn’t look right” prompted orthopedic referral (image: lateral radiograph of the left ankle).

The patient was taken urgently to the operating theatre. What is the diagnosis? Source: thebmj *This case is from Docplexus editorial team for educative purpose only