May 7, 2026, 4:23 am | Read time: 4 minutes
If a horse suddenly moves more stiffly or doesn’t run smoothly, osteoarthritis might be the cause. This joint disease often develops gradually and goes unnoticed for a long time. PETBOOK explains the symptoms to watch for and what owners should be aware of.
What Happens with Osteoarthritis in a Horse’s Body?
For a horse to move freely, its joints must function smoothly. You can think of a joint like a well-oiled hinge. Two bones meet there, and their ends are covered with a smooth, elastic layer–the cartilage. This ensures nothing rubs or “catches.” Additionally, there’s a fluid in the joint that acts like a lubricant and nourishes the cartilage.1
With osteoarthritis, this “hinge” gradually wears down. The protective cartilage layer becomes thinner and rougher. As a result, movements are not as smooth as before. Instead, there’s more friction in the joint, which can make movements appear stiff or difficult for the horse.
The bone beneath the cartilage also changes over time. It reacts to the increased stress by forming small outgrowths. At the same time, the “lubrication” in the joint doesn’t work as well as it used to. The fluid doesn’t distribute as effectively and can’t support the cartilage adequately.
Often, joint irritation is also present. The joint can then swell, become warm, and painful. For the horse, this means it moves more cautiously, doesn’t run smoothly, or shows significantly less enthusiasm for movement.2
Causes of the Disease
Osteoarthritis usually doesn’t develop suddenly but over a longer period. It often results from a combination of several factors.3
The main causes include:
- Overuse and improper loading
- Age: The cartilage’s ability to regenerate decreases
- Misalignments: Uneven stress due to misalignments
- Injuries: Damage to tendons, ligaments, or bones
- Joint inflammations (arthritis): Often considered a precursor to osteoarthritis.
- Lack of movement
- Malnutrition
- Overweight
- Hoof problems or improper shoeing
- Hard or slippery surfaces add extra stress to the joints.
- Genetic predisposition
Muscle tension can also play a role. It restricts mobility and affects cartilage nourishment, as movement is necessary for nutrient absorption.
How Can I Recognize Osteoarthritis in My Horse?
The signs of osteoarthritis usually develop gradually and are often recognized late. It’s important to observe the animal closely and take the time to do so if there’s suspicion.
Typical symptoms include:
- Lameness
- Joint stiffness
- Swelling and overheating of the joints
- Pain, cautious movements, or defensive behavior
- Reluctance to move, avoidance behavior
- Irregular or restricted gait
- Protective posture
For further diagnosis, documenting complaints is helpful. Video recordings can also be valuable for the veterinarian to make an accurate diagnosis.
Diagnosis and Treatment of Osteoarthritis
The diagnosis is carried out step by step. First, the veterinarian observes the horse in motion and examines the joints. They check for mobility, pain reactions, and possible swelling.
Other examination methods include:
- Flexion test
- X-rays
- Possibly CT or MRI
- Arthroscopy
Subsequently, the treatment aims to relieve pain and slow the progression of the disease.
The treatment plan might include:
- Pain relievers and anti-inflammatories
- Physical therapy
- Regular, adjusted exercise is crucial
- Circulation-promoting measures
- Orthopedic shoeing
In advanced cases, surgical interventions may be necessary, such as smoothing cartilage or fusing a joint.
When a Horse Limps, This Disease is Often the Cause
Why Is My Horse Lame?
Can Osteoarthritis in Horses Be Cured?
Osteoarthritis is considered incurable because damaged cartilage cannot be fully restored to its original state. Additionally, the course depends on various factors, such as age, extent of joint damage, and the number of affected joints.
An early diagnosis significantly improves the prognosis. The goal of treatment is to maintain the horse’s quality of life for as long as possible and to reduce pain.
How Can I Prevent Osteoarthritis in My Horse?
Preventive measures play a crucial role, as many risk factors can be influenced.
Important measures include:
- Regular exercise
- Adequate warm-up before exercise
- Appropriate housing
- Balanced feeding
- Weight control
- Suitable surfaces, avoiding unnecessary impact stress
- Regular hoof care
Early treatment of muscle tension and movement disorders can also help reduce the risk.