Hindlimb lameness in horses is often subtle and challenging to diagnose, requiring systematic investigation to identify the location and cause of pain.
Hindlimb lameness welfare implications are significant because the subtle presentation means horses often work in pain for extended periods before diagnosis. Horses cannot report pain through verbal communication, and the hip hike sign of hindlimb lameness is much less obvious to most owners than forelimb head nodding. Performance horses with hindlimb pain from sacroiliac disease or stifle pathology often show 'behavioral' signs interpreted as disobedience - resistance to collection, reluctance to engage hindquarters, bucking - before the pain source is identified. Treating behavioral signs without investigating pain is a welfare failure that prolongs suffering. Systematic nerve block examination by an experienced equine veterinarian is the most reliable method for identifying the pain source.