Good interpretation of the x-ray requires views from at least two different angles since they are two dimensional studies looking at a 3 dimensional situation. It also requires examination of the area as there are several ligaments that contribute to the stability of the area and I don't know if they have been disrupted. However, from what I can see, this could be a very unstable fracture. The fix may well involve more than just casting the area including surgery and fixation with hardware ie. screws plates, etc.
Again, it is hard to formulate an opinion based on a one view x-ray and no examination so reality may end up being different from what I'm thinking. Please keep me updated.