11-19-2010, 01:01 AM
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By 8 years old it's entirely feasable that there could be arthritic/boney changes in the joints. Largely dependant on the type of work the horse has had to do. It's extremely common in Thoroughbreds and Warmbloods, because most TB's are started too early, and most Warmbloods (especially those who are aimed at dressage) are 9 times out of 10 just generally weak in the joints. In part, due to their size.
If he continues to disunite, even after having injections and provided your saddle is fitting properly, I'd highly recommend getting xrays and scans done of the stifle and hock in particular. Some form of physio therapy in conjunction with strength building wouldn't go amiss either.