Arthritis, or degenerative joint disease (DJD), is a widespread and progressive condition in horses, particularly in the aging population. It involves the inflammation and gradual deterioration of cartilage within the joints, leading to pain, stiffness, and reduced mobility. Since cartilage serves as the smooth, cushioning surface between bones, its breakdown causes increased friction, joint instability, and chronic discomfort.
While arthritis is not curable, early diagnosis and proactive management can significantly enhance a horse’s quality of life and extend its active years.
Recognising the Signs of Arthritis
Signs of arthritis can vary, especially in the early stages. Horses may show:
- Mild or intermittent lameness, often improving with exercise.
- Stiffness, particularly after rest
- Swelling or heat around a joint
- Reluctance to perform certain movements or a change in performance.
These signs can be subtle at first and may become more obvious with work or age.
Diagnosis
Veterinary diagnosis usually begins with a lameness examination, where the horse is observed moving on different surfaces, often followed by flexion tests to stress specific joints and highlight discomfort. To localise the issue more precisely, vets may perform nerve or joint blocks.
Radiography (x-rays) is the most common imaging technique used to confirm arthritis once bone changes are present. In some cases, ultrasound or advanced imaging like MRI or CT may be used, particularly when soft tissues or early changes need to be evaluated.
Treatment
Lifestyle and Exercise
A critical part of managing arthritis includes non-medical strategies:
- Weight management: Keeping the horse at a healthy weight reduces stress on joints.
- Regular, low-impact exercise: Gentle work such as hacking, in-hand walking, or turnout promotes joint mobility and slows stiffness.
- Stable management: Horses should not be left standing still for extended periods, as immobility can worsen stiffness.
Adjustments may be needed to a horse’s workload. A previously competitive horse may transition to light work, while others may benefit most from daily turnout if ridden work becomes uncomfortable.
Therapeutic Options for Arthritis
In addition to lifestyle changes, several therapeutic treatments can support joint health and reduce pain. These can be grouped into nutritional, pharmaceutical, injectable, and regenerative therapies:
1. Joint Supplements (Nutraceuticals)
Often used in long-term management, joint supplements may contain:
- Glucosamine and chondroitin sulphate
- Hyaluronic acid (HA)
- MSM (Methylsulfonylmethane)
- Omega-3 fatty acids
- Collagen derivatives
These ingredients aim to support cartilage health and reduce inflammation, though results can vary between individuals. Always consult with a vet to choose a formulation appropriate for your horse.
2. Oral Anti-inflammatories
The most commonly used drugs for managing arthritis pain are non-steroidal anti-inflammatory drugs (NSAIDs), such as:
- Phenylbutazone
- Suxibuzone
- Flunixin meglumine
- Firocoxib (a COX-2 selective NSAID)
These medications reduce pain and inflammation, enabling more comfortable movement. While effective, they should be used cautiously—especially long-term—due to potential side effects, such as gastrointestinal or kidney issues.
3. Intra-articular (Joint) Injections
When systemic medications aren’t sufficient, direct injection into the joint can provide stronger and more targeted relief. Options include:
- Corticosteroids: Potent anti-inflammatories used to reduce joint inflammation.
- Hyaluronic acid: Aids in joint lubrication and shock absorption.
- Polyacrylamide gels or other viscosupplements: Designed to protect remaining cartilage and improve joint mechanics.
These injections can provide significant relief, especially in moderate to severe cases, and are often repeated based on the individual horse’s needs and response.
4. Disease-Modifying Treatments
Some therapies aim to slow the progression of joint degeneration rather than only manage pain. Examples include:
- Bisphosphonates: Injectable medications that reduce bone turnover and may help in cases where subchondral bone pain or remodelling is a concern. These are used selectively and must be prescribed carefully.
- Polysulfate glycosaminoglycans (PSGAGs): Help protect cartilage and may reduce inflammation when injected into or around joints.
5. Regenerative Therapies
These emerging treatments use the horse’s own cells or growth factors to promote tissue healing. More are being developed all the time with varying evidence of efficacy. Speak to your vet for more information.
Prognosis and Quality of Life
Although arthritis is a progressive condition, many horses with appropriate management plans & medications can continue to enjoy an active life. Some may remain in light work or hacking, while others may need to transition to a non-ridden lifestyle.
Ongoing veterinary monitoring is essential, especially when using long-term medications, to ensure the horse remains comfortable and to adjust treatment as needed.
If you are concerned your horse may be developing arthritis or would like to discuss treatment options, please do not hesitate to contact us.