Hello, I have a 3 yr old thoroughbred mare, last raced Nov this year, sold as being sound, bought her 2 weeks ago. Her 4th day here I found her in her stall stumbling, one time extended hind leg back with toe under- vet dx locked stifle. Then this was not seen again. Now she has spasms in that leg (like shock waves going down her leg intermittently). No heat, some swelling to gaskin and stifle area, sometimes pain on touch, did not seem lame. 2nd vet dx same or could be partial ligament tear. Rural area so no xray or ultrasound available. Treatment for both is very different. Any suggestions??