I have a 20-year-old Quarter Horse that is in top working condition, worked daily in basic dressage, and he is always happy to jump whatever I ask him to. However, before I purchased him, he had a deep wound in his offside flank. It’s long been healed, but it has left a star-shaped scar. He is very supple on his near side, but his hip is stiffer on the wounded side. Could this be from old wound tissue scarring, or perhaps some ancient muscle damage? I would like to know if physical therapy would help make this side become more supple, or can I have the scar tissue removed surgically? Any help you could give for limbering up a back end with former healed injury like this would be welcomed.