Canine Elbow Dysplasia

Canine elbow dysplasia (ED) is a disorder characterized by a range of developmental abnormalities affecting the elbow joint. The elbow is a highly complex joint composed of three bones: the radius, ulna, and humerus (Figure 1). When these bones fail to develop and align correctly, abnormal loading occurs within specific regions of the joint, leading to pain, forelimb lameness, and the gradual development of osteoarthritis.

Elbow dysplasia is an umbrella term that includes several conditions classified as medial compartment disease—such as fragmented coronoid process (FCP), osteochondrosis (OCD), joint incongruity, and cartilage abnormalities—as well as ununited anconeal process (UAP). The exact cause of ED remains uncertain. Various contributing factors have been proposed, including genetic predisposition, abnormal cartilage development, trauma, nutritional influences, and others. Currently, ED is widely regarded as a multifactorial disease that disrupts normal joint growth.

ED is an inherited condition that may affect many dog breeds but is most commonly observed in large and giant breeds. Up to 80% of affected dogs have involvement of both elbows. Breeds such as Bernese Mountain Dogs, German Shepherds, and Golden Retrievers show increased susceptibility to UAP, while Labrador Retrievers, German Shepherds, and Golden Retrievers are particularly predisposed to medial compartment disease.

Once damage occurs within the elbow joint—whether due to cartilage loss, medial compartment disease, or an ununited anconeal process—joint inflammation and further cartilage degeneration follow. This process ultimately results in progressive elbow osteoarthritis, causing chronic pain and reduced joint function.

Dogs with elbow dysplasia typically begin to show clinical signs at a young age, most commonly from around five months of age, although some cases may not be diagnosed until 4–6 years later. Affected dogs develop forelimb lameness that gradually worsens over weeks to months. Lameness is generally more pronounced after exercise and rarely resolves completely with rest.

In many cases, both forelimbs are affected, making lameness more difficult to detect because the gait may appear symmetrical. When both elbows are involved, dogs may become reluctant to exercise for extended periods or may refuse to complete a walk altogether.

Diagnosis of elbow dysplasia is typically based on a combination of physical examination and radiographic assessment. Pain is often elicited during full flexion or extension of the elbow, and veterinarians commonly observe the dog walking or trotting to assess gait abnormalities.

Radiographs usually reveal signs of osteoarthritis and may also demonstrate the presence of small bone fragments within the joint or an ununited anconeal process (Figures 2 and 3). In some cases, referral to a veterinary orthopedic specialist may be recommended for advanced diagnostic procedures, including computed tomography (CT), magnetic resonance imaging (MRI), or arthroscopy (Figures 4 and 5).

Treatment options depend on the severity of elbow dysplasia. Surgical intervention is recommended in most cases; however, medical management may be advised when the disease is very mild or when severe joint degeneration limits the potential benefit of surgery.

Therapy is directed toward the primary cause of the condition. Arthroscopic surgery is commonly preferred, although traditional open surgical techniques may also be used. Depending on the individual case, surgical procedures may include:

• Removal of coronoid fragments and loose cartilage (FCP)
• Surgical modification of the elbow to redistribute weight away from damaged areas
• Fixation or removal of an ununited anconeal process (UAP)
• Correction of joint incongruity through ulnar osteotomy
• Total joint replacement in cases of severe joint disease

Postoperative care varies according to the type of surgery performed, and specific instructions are provided by the attending veterinarian. Generally, dogs require strict activity restriction and confinement for a period ranging from 2 to 6 weeks or longer.

Outcomes vary among patients, but milder disease and earlier intervention are associated with improved long-term results. Most dogs benefit from surgical treatment even in advanced cases; however, once osteoarthritis has developed, it will continue to progress over time regardless of treatment. Approximately 85% of treated cases demonstrate improvement in comfort and lameness, despite radiographic progression of arthritis. The primary goal of treatment is to slow the progression of osteoarthritis and maintain functional use of the elbow. Although elbow dysplasia cannot be cured, effective management through a combination of surgical and medical treatment can provide dogs with a good long-term prognosis and quality of life.