[QUOTE=... They feel that he healed but it is what it is. It will cause him trouble if he twists it in the pasture and they suggested that he not be exersized in deep sand. The vet suggested he wear a SMB for workouts if I'd like some ankle support.[/QUOTE]
I've just started using the SMB neoprene boots with my mare that had a bone chip removed from one fetlock several years ago, which I believe sometimes gives her pain, and it's made a world of difference. It actually supports the fetlock, restricting some of the movement, causing less aggravation on the scar tissue. I've been riding her in fairly deep sand, and she's fine during and after her, admittedly short, sessions.