An unsoundness is any abnormality that interferes with a horse's usefulness, while a lameness specifically affects its way of moving. Common unsoundnesses and lamenesses include bowed tendons, arthritis, fractures, and injuries to the feet. Veterinarians examine horses for lameness by observing how they stand and move, and how they respond to hoof tests. Many conditions are treated through rest, corrective shoeing, or surgery as needed.