lameness! degree of lameness depends on the horse and the severity of the injury. my horse was hardly lame at all, but crippled after flexion when he had it. it's the same for hindlimb and forelimb - it causes lameness - not sure what else you want?
My horse showed no lameness at all with hindlimb proximal suspensory desmitis
but his pastern angle was low
he constantly shifted his weight from one hind leg to the other and struggled to hold his legs up for picking out feet and the farrier
mine wasn't really lame either until you flexed him when he was crippled. he would rest his right hind a lot (only had it in that leg) and then he would walk off really stiff after being tied up. he was still performing fine at dressage though, no problems with the farrier. no change in the angle of his fetlocks or pasterns.
Hi my horse has just had the operation to hopefully correct this problem. In the beginning he wasnt lame I just couldnt get him to work correctly from behind and my trainer decided he had something wrong with him. He wasnt clearly lame after flexion tests either. We tried him on bute and he worked lovely, there started a long year of finding out what was the problem. During the year he got worse, you still couldnt really see clearly he was lame as he was lame in both hind legs but you could feel his way of going was getting worse (I had been told to keep riding at a walk by the vets). Anyway nothing worked so he has had the fasciotomy and neurectomy, this was 7 weeks ago and at the moment he is sound in walk but trots short with the near hind. He has gone for hydrotherapy treatment for a couple of weeks now so fingers crossed.