Just a quick comment from an "injured" rider.
Last November I had a "nasty" crash during practice for motocross (my fault, the throttle stuck wide open in third gear). Both ankles broken, small bones in both feet broken and left tibia broken just below the knee. Lots of titanium screws, a few pins and a steel plate and all has joined up nicely. Back on the MX bike, find that I have become a potential liability. Although I can manage all the controls, shift my weight around, stand, etc., my left leg is weaker than the right and I have nasty wobblies on landing from jumps. The situation has since become self regulating as both ankles swell up. If I can get my boots on, I cannot get them off again! The urge to keep riding (racing) is strong but I will have to be sensible and wait a few more months. The problem is I will be 61 next month and I don't want to loose the enthusiasm.