What a good thing you went looking for him. Alot of people would just assume he'd run away and wait for him to turn up.Not me, Over the years I have spent hours trawling the streets for missing cats, leafletting the neighbours, putting up posters etc. It does work, because my late cat only turned up, after 2 weeks when I leafletted the neighbours. I think someone might have taken her in then released her when they realised she belonged to someone. (she was an indoor cat who had escaped so she wasn't known by people round here) I think when they are injured, like Roger, their instinct is to hole up somewhere. They are in shock, and in in pain, possibly disoriented. So glad you have him back, and hope he continues to improve. Wonder why the vet didn't pick up on the fractured pelvis right away?