Hi am currently rehabilitating an off the track Appendix TB. The girl who originally found him back in April had a vet examine him. He found some scarring around his knees(white hair) and said he has damage to his knees and will never be a jumper or barrel racer but is fine other than that. He said the condition was called something but the girl can't remember what it is. In the last week and a half he has become very tender on his left knee. He moves and trots just fine but if he is stalled for any length of time he becomes tender. Two different times I have lifted his right hoof and he has fallen onto his knees. Now his left knee is slightly swollen. If he is fresh out of the stall he will stumble on that leg but after he has had time to move around it gets much better but the swelling is still there. He is now staying pastured and his vet appointment is tomorrow morning but I was hoping someone would have some type of idea of what this is. Oh and his right leg is starting to seem sensitive too but that might be my imagination.