The digital pulse is taken on the inside of the pastern, right below the fetlock. The fetlock joint was dislocated, and his foot was left dangling loosely. False positive results from this flexion are especially common in the front fetlock joints. Throughout his career, Assault also overcame kidney, splint bone, fetlock, knee and bleeding problems. An osselet is inflammation (arthritis) of the metacarpophalangeal joint (fetlock) of the equine front leg. Each of these factors encourage the overextension of the fetlock and knee during work. In horses, sesamoiditis is generally caused by excess stress on the fetlock joint. In the horse it occurs at the horse's fetlock. In thoroughbred race horses, the fetlock is involved in roughly 50% of catastrophic racing injuries. A fetlock injury ended her racing career. This stresses the soft tissues that run under the fetlock because they are stretched longer. Fetlock luxations account for 91% of all fatal luxation injuries. He raced twice as an eight-year-old before chronic fetlock problems finished his racing career.