Older horses may show signs of slight stiffness in their gaits. This can be caused by arthritis. Arthritis is almost unavoidable as a horse ages, but can be managed with conscientious care.
Arthritis is caused by the slow wearing of cartilage; a tough, flexible tissue that is the shock absorbing and sliding surface between the bones that meet at a joint. Over time, compression and stress wear away the protective cartilage. Arthritis most commonly occurs in the weight-bearing joints of the legs and hooves. Extra stress or injury to any joint can lead to arthritis. Pain occurs as the cartilage thins, resulting in pain, inflammation, stiffness and eventually, lameness.
In its early stages, arthritis may appear as a slight stiffness that the horse works out of once it is warmed up. In the joint, the cartilage material is breaking down, but not repairing itself efficiently. Eventually, as the cartilage becomes more damaged, the bone beneath the pad of cartilage becomes damaged as well. The horse will then experience more discomfort and there may be heat in the joint as inflammation occurs. In more advanced cases, small bony growth called osteophytes may be seen under x-ray, and may be felt around the affected joint. As the disease progresses, the horse may experience more discomfort and lameness.
If you suspect your horse has arthritis it's important to get a veterinarian's diagnoses. This will probably include imaging to examine the joints.
Younger horse can become arthritic too, with something call septic arthritis, which is difficult to treat. Antibiotics must be injected into the joint capsule to combat bacterial infection. However, irreversible damage may be done to the joints of a foal once septic arthritis has occurred.
Equine arthritis can affect any joint in the body, including the knees, shoulder joints, neck, fetlocks, hocks, back and stifles. The fetlocks, knees, coffin (within the hoof) and hocks are most commonly affected. These are all weight-bearing joints.
Once the cartilage in a joint is gone, it is very difficult to repair it. Further damage and discomfort may be waylaid by injections of healing or lubricating fluids such as hyaluronan, glucosamine and corticosteroids to name the most commonly used therapies. For very short-term pain relief, quipalazone (bute or butezone) may be used, but long-term use can lead to kidney damage and bute cannot be used when competing.
Stem cell therapy is also possible, although a more costly alternative. The goal of any treatment is to reduce the inflammation in joints, relieve pain and slow the cartilage breakdown. There is no cure for arthritis, at this time.
In addition to veterinary treatment, a reduction in workload may be necessary, especially if the work includes jumping, travelling over hard terrain or other activity that over-stresses the joints. This may mean the end of a horse's competitive career, although light exercise is important to maintain joint flexibility. At times when the horse may be lame, it should not be ridden. Keep the horse on soft footing, with extra, but not excessive bedding that may be hard to walk through, in stalls. Proper trims and shoeing by a knowledgeable farrier may also be helpful.
While cartilage transplant and other therapies are now possible, they are costly and the outcome is not guaranteed. Because arthritis is a common problem, research into its exact causes and more effective treatments is ongoing.
Some people have found herbal preparations to be effective for relieving discomfort, but it may not be wise to use them without consulting a veterinarian.
Arthritis, to some degree is almost unavoidable in older horses. Horses with conformation faults may put extra stress on joints, yet another reason why breeders strive for foals with good conformation.
Proper hoof trims and shoeing, good conformation, providing good footing, while also providing good basic maintenance are the basics of waylaying arthritis as much as possible.