The hip joint is a ball-and-socket joint, where the head of the femur (thigh bone) fits into the acetabulum (hip socket). In a healthy dog, this joint is stable, smooth, and well-aligned, allowing pain-free movement. In dogs with hip dysplasia, the joint does not develop properly. The ball and socket may not fit tightly, leading to looseness (laxity), abnormal wear, and gradual deterioration of cartilage over time.
Hip dysplasia is a multifactorial condition, influenced by both genetics and environmental factors such as growth rate, nutrition, body weight, and exercise. Large and giant breeds are more commonly affected, but it can occur in any dog.
Clinical signs of hip problems may vary depending on severity and age of onset. In young dogs, symptoms can include reluctance to run or jump, difficulty rising, a “bunny-hopping” gait, or decreased activity levels. In adult or older dogs, chronic joint pain, stiffness after rest, reduced range of motion, and lameness in the hind limbs are common signs. Over time, hip dysplasia often leads to osteoarthritis, causing progressive pain and reduced mobility.
The hip testing procedure is typically performed using radiographic imaging (X-rays), often under sedation or anesthesia to ensure proper positioning and accurate results. The X-rays are evaluated by veterinarians or certified scoring organizations that assess joint conformation, laxity, and signs of degenerative change.
Results are generally reported using grading systems such as:
- Excellent / Normal: Hip joints are tight, well-formed, and free from signs of dysplasia.
- Good / Fair: Minor irregularities may be present but without significant functional impairment.
- Mild Dysplasia: Some looseness or early structural changes are visible, with increased risk of arthritis.
- Moderate Dysplasia: Clear joint laxity and early arthritic changes affecting mobility.
- Severe Dysplasia: Advanced joint malformation and significant arthritis, often associated with pain and lameness.
Hip testing is highly valuable for breeders, veterinarians, and dog owners. For breeders, it helps identify dogs with healthy hip structure and avoid breeding those with poor hip scores, reducing the prevalence of hip dysplasia in future generations. This is one of the most important tools in improving long-term orthopedic health in dog populations.
For dog owners, hip testing provides critical insight into joint health and helps guide lifestyle and medical decisions. Early detection allows for proactive management such as weight control, controlled exercise, joint supplements, physiotherapy, and pain management strategies. In severe cases, surgical options such as hip replacement or femoral head ostectomy (FHO) may be recommended.
The Hip Testing (Hip Dysplasia Evaluation) is a reliable orthopedic screening tool that supports responsible breeding practices, improves canine mobility health, and helps reduce the impact of this common and often painful joint disorder in dogs.
