Wat beroerd Franca. Sonja gaf je al een link naar horseshoes.com . Maar wat je misschien ook nog kunt doen is naar deze site van hen gaan. 
http://www.horseshoes.com/fhlpown/bb8/frhlhron.htm
Dit is een forum waar hoefsmeden mensen advies geven als ze dit soort problemen hebben. 
Ik heb hele goede ervaringen met de hoefsmeden en artsen  op deze site. Ze geven je echt goed advies. Misschien dat ze je daar kunnen helpen. Het zijn smeden uit de VS en daar zijn ze vaak toch net wat verder in bepaalde dingen dan hier. Je hebt denk ik al veel aan de reacties die op de eerste vraag om hulp worden gegeven.
rick van horseshoes schreef:  You cannot do a resection of any scope without providing mechanical support for the bony column. this will involve the application of(preferably) a heart bar shoe, clips and/or some other form of caudal hoof support,i.e: impression material and a hard caudal pad. A shoe can be glued to his foot if there is absolutely no where to drive nails. The hoof can be (except in the resected area) strengthened or rebuilt with acrylics and then a shoe nailed to that. 
If he is on a grain based ration, cut the grain, especially the carbohydrates, and feed him a ration that is protein based and low to no carb based. He will absolutely need a minimum of 1.5 lbs/day/1000lbs of horse of protein. If he is fed alfalfa hay, quit and start feeding a grass-only hay. You can feed him almost as much as you want of a grass hay, especially if it is older(like last year's cutting). this will keep him busy in the stall, too. If necessary, discuss with your vet the idea of a feed through tranqulizer to help him along. Depending on the degree of resection, the horse does not need to be on full layup. Exercise is a good thing, whether it be long sessions of hand walking, or, as conditions permit, light hacking. Many of the horses I have performed resections on, never miss a day's work. The owners just have to be prudent about what they do and where they do it.
Also make sure that your horse is getting high levels of biotin and methionine, and discuss with your vet, adding 100,000IU of Vitamin A to the ration on a daily basis. this vitamin is important in the hoof growth process, and , anecdotally, it has been noted that often horses with WLD are deficient in it.
Veel succes