Seeing as his rap sheet shows he can't follow the law, I can believe, that if he had this surgery, he didn't follow the doctor's orders either.
"'Fractured tibia, sergeant'? 'Fractured tibia, sergeant'? Ooh. Proper little mummy's boy, aren't we? Well, I'll tell you something, my fine friend, if you fracture a tibia here you keep quiet about it! Look at him! (looks more closely) He's broken both his arms and he don't go shouting about it, do he? No! 'Cos he's a man - he's a woman, you see, so don't come that broken tibia talk with me. Get on at the double. One, two, three, pick that crutch up, pick that crutch right up."