Fused hocks basically mean that a horse cannot bend his/her leg because the bones in the joint have 'fused' (or joined). Basically the horse doesn't have use of the joint anymore.
A horse's hock is located on the back legs of the horse. It is the joint that would act as a knee for the horse and is the large joint located about half way up the horse's leg.
No, no, 1000 times no! If a broken hock is ridden on and/or is not professionally set, it can result in the horse being crippled. THis is considered animal abuse and is a violation of the law---if...