I've known a couple of horses who have had annular ligaments cut, but this was due in both cases to damage to the annular ligament itself initially. I *think* it was done because the damaged ligament can scar/tighten or be inflamed and swollen, in turn putting pressure on the tendon, thus causing further problems. I guess in your case, the vet is saying a similar thing, only the ligament is constricting swelling in the tendon. My own boy had annular ligament problems but fortunately recovered with rest alone. The other two horses are able to be worked lightly, but I think were advised against jumping and fast work (after much box rest and restricted turnout). I do wonder, as AmyMay says, whether time and rest would bring about the same result!
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