During this time, the horse may benefit from being barefoot if his hoof is stable and strong enough. However, newer studies have shown much more movement at the pastern joint than was previously thought. Meticulous attention to trimming and hoof dynamics coupled with a sufficient amount of rest to allow the area to quiet down and set up may be all that is required to return the horse to soundness. Articular ringbone always means underlying arthritis as well. If you examine a hoof like this from the sole view, youll see that there is more sole on one side than the other, and the tip of the frog often does not point to the center of the hoof wall at the toe. Conversely, seeing extensive calcium deposits on an X-ray doesnt necessarily mean the area is causing the horse pain. Screws and/or plates can be placed to bridge and stabilize the joint. If its not enough to halt the process, surgery is an option.

Toes should be short enough to allow easy breakover and rounded.

However, this risk can be minimized by trimming the hoof to keep the bones in their natural alignment. Horses whose pastern and foot axis deviates in or out rather than being directly aligned under the fetlock may be at higher risk for ringbone. Many horses can continue to compete for many years with these treatments. When ringbone appears at an early age, the cause is often OCD (osteochondrosis). Low periarticular ringbone is basically treated the same way, but it may not be accessible for shock-wave therapy. Unfortunately, there are no surgical options for low articular ringbone. Ideally, the frog will have contact with the ground when the horse is weightbearing to take full advantage of the natural shock absorbing structures of the foot. As with any lameness, nerve blocks and/or local anesthesia of joints or areas of suspected soft-tissue damage must be done to confirm a diagnosis of lameness that is caused by ringbone. Defects in the formation of a healthy bone cartilage junction that occur while in the uterus or at a young age lead to joint disease and bone chipping that causes articular ringbone. Both high and low articular ringbone is usually initially treated as above (trimming, shoeing, rest) and with intra-articular injections of hyaluronic acid and/or corticosteroids.

Each case of ringbone will be described as either high (pastern joint area) or low (coffin joint area), and by whether it involves the joint (articular) or not (periarticular). Young horses with articular ringbone related to OCD fragments has a guarded prognosis. Biomechanical studies have shown that the hoof wall and these two joints absorb most of the force of impact. Hoof Care:Poorly balanced hooves that cause the horse to land on one side of the hoof more than the other also are subject to uneven joint loading, with high forces through the joints on the side that lands first and excessive stretching of joint capsule, tendons and ligaments on the other side. While the prognosis is better than for low ringbone that actually involves the coffin joint, its more difficult to protect this area from concussion. Bottom LineHigh periarticular ringbone, which involves areas of soft-tissue attachment to bone, has the best prognosis.

Corrective trimming cant realign the horses natural bone axis. These horses may also respond well to shock-wave therapy. Concussion: Work on hard surfaces increases the forces on the lower leg joints on impact. Six to eight weeks rest, to allow active areas of inflammation and remodeling to quiet down, is usually recommended. Horses with club feet or upright pasterns are less efficient in distributing forces on impact and this jamming and jarring is hard on the pastern and coffin joints. Some vets may even choose to put these horses in a cast for a few weeks, to further minimize movement. Its important to make the distinction between the types of ringbone because this influences the prognosis for soundness with treatment. X-rays can help with these evaluations, and a conference between your farrier and veterinarian to decide on needed corrections is in order. Progress can be followed by ultrasound and X-rays. Standing in front of the horse, check to see if the center of the toe corresponds to a line drawn directly through the middle of the bony column of the pastern. On the side view, check for excessive heel height and any deviation from a smooth, straight axis through all the bones of the pastern and foot. More ringbone is caused by trimming that forces the foot back under the ankle, or deliberately introduces side-to-side imbalances to correct winging in or winging out. Arthroscopic surgery to flush the joint and remove the irritating fragments is usually necessary and may be followed by a prolonged course of Adequan, Legend, and/or oral joint nutraceuticals. When trimming doesnt follow the natural alignment of the bones, uneven forces are developed that can easily result in ringbone caused by joint, joint capsule, tendon or ligament damage. If extensive damage and tearing to soft tissue structures stabilizing the joint has been diagnosed, several months rest may be needed to get good healing. Leaving the heels too high has also been shown to result in more movement of the pastern joint. Risk FactorsSport: Jumpers, eventers, polo ponies and working Western horses, which must make sharp turns at high speeds, are at increased risk for ringbone both because of uneven joint loading and risk of soft tissue tears (joint capsule, tendons, ligaments). DiagnosisEarly ringbone, before much of anything is even visible on X-rays, can be an extremely painful stage for the horse. It used to be thought that problems involving the pastern joint had a better prognosis because this joint was relatively immobile. Treatment OptionsAvailable treatments depend on the location and type of ringbone, but the first step should be a search for correctable causes. If shoes are used, a beveled or rocker toe assists with breakover. Our Types of Ringbone table (see above, right)lists the various types of ringbone and possible causes. Traumatic ringbone may occur anywhere along the pastern. The gel pads provide gentle, even support and mold themselves well to the contours of the individual foot. If it doesnt, consult your farrier. Many horses also benefit from either full pads with soft-support material underneath, Therapeutic Honeycomb pads from Supracor (www.supracor.com/, 888-924-6773), or the newer gel support pads from (www.impactgel.com/, 866-321-8729). Success rates as high as 85% have been reported.

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