BBC.com is reporting that Harrison Ford broke his  left leg, not his ankle.  They confirmed this via his publicist.  According to the  BBC.com report:

Harrison Ford’s left leg was broken in the injury he suffered while shooting the new Star Wars film, the US actor’s publicist has confirmed. It was previously believed the 71-year-old had broken an ankle in an incident involving a door at Pinewood Studios on 12 June. “His surgery was successful and he will begin rehab shortly,” continued Ina Treciokas in a statement. “He’s doing well and looks forward to returning to work.”

Full story at BBC.com