Originally Posted by loosie
I think this depends on the horse's 'career' too. Obviously if you're wanting a high performance athlete the horse may not be up to it, or for long, but this is such a common problem & IME many trail horses work into old age without apparently(I know...) suffering from it.
The last horse I saw that had the degree of bump the horse in the OP had, the vet and chiro both said that even saddling the horse would be dangerous because the horses hind end would likely give out from under him.
But yes, there are horses that do fine as nothing more then back yard pleasure ponies not asked to do large amounts of work.