Most of the horse's weight is carried on the outside of the hooves. The hocks bow outward during stride. Horse will interfere. The hocks rotate outward. Horse moves stiffly due to inflexible hock action.
Hindquarters are weak and the horse tires easily.
The hocks are pointed inward - feet pointed outward. Places strain on inside of the leg and causes bone spavin. Hind leg moves upward and outward - not straight ahead. This is weak conformation. This is a serious fault.