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He is higher on the lateral heel on that foot. Out of balance. That can certainly cause lameness when he turns toward that foot because during the loading phase of the stride in the turn it will stress the medial collateral ligament of the coffin joint, and the joint itself.
Club feet tend to land hard on the lateral toe a due to an odd shape of the long pastern bone in that leg . The foot eill swing inward when in the air and hit on the outside toe., The landing can not be helped very much because it has to do with bone shape in the pastern.
So when you add a high heel on that side it makes the coffin joint problems even worse. And it will show up the most when the horse is turning toward that foot.