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im not sure about common but i have an ex racer and dso does my firend and both of them do it. they both event and have no problems.
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Thats why I was asking, my friend was talking about loaning a 12y.o novice horse (about 5 points) and when in the stable and she moves, her hock sort of locks but I understood it was common anyway - is it a major issue? She's an ex hurdler.