My horse has been lame since 2nd July 2009. Lameness was noticed 2 days after he had taken a tumble (in walk) whilst hacking and fallen on his fore right knee (maybe hitting the back of his knee with back leg). Vet inspection resulted in diagnoisis of damaged suspensory ligament. Six weeks into box rest a second scan showed no damage to ligament so vet presumed it was the blow to the leg. Horse became almost sound. Vet prescribed a 4 week course of cartrophen. A pattern has emerged that the cartrophen is effective from the day given for 5/6 days then lame again. He has been walked and trotted a little on the roads for the last 7 days but now has become more severely lame. The last cartrophen was given yesterday and we have decided to boxrest again. He has not been turned out at all. Any suggestions?

Optional Information:
Type of Animal: Welsh Cob
Gender: Gelding
Age: 14

Already Tried:
Box rest and cartrophen