These photographs are slightly less depressing; taken at an RAF rehabilitation centre in 1942, they show the various aspects of recovery for lucky (ish) pilots. Naturally this is the nicer side of the process, for public consumption; but even so.
Exercising an injured leg. [The captions use 'damaged'; I dislike this, it makes the men sound like machines.] Source
Pilot taking a bike ride as part of his post-broken leg rehab. Source
Exercising injured legs. Source