I think the obvious solution is to move his feeder - it is normal for horses to paw at the ground (mine do it all the time - some 'primal instinct' that they seem to enjoy). Why not just move the feeder so that when he 'paws' he is pawing dirt or hay - if you can't do this perhaps you can feed him in a 'tub' that is on the floor in the 'middle' of the stall so he can't hurt his knee on the wall. In their natural state horses eat with their heads down - not the way we feed them in a 'hanging' bucket.
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