This might not be that helpful, but our Cockerel Michael is permanently lame after an incident - we 'rescued' him as we were in the market for a cockerel. He's a splendid Sussex, but can hardly put any weight on one of his legs. I umm and aah daily about whether to do the decent thing, but he is in rude health, displays all normal behaviour, free ranging much of the time and looks after his ladies very well. And he's a gentleman. I have no idea if he's in pain or not. Now he's a dad!