Introduction
Canine hip dysplasia (CHD) is one of the most common orthopaedic disorders affecting dogs worldwide. It is a developmental condition characterised by abnormal formation of the coxofemoral (hip) joint, leading to joint instability, pain, osteoarthritis, and reduced quality of life. The disease particularly affects medium and large breed dogs, including German Shepherds, Labrador Retrievers, Golden Retrievers, Rottweilers, and Bernese Mountain Dogs. Hip dysplasia presents a major challenge in veterinary medicine because it is influenced by both genetic and environmental factors.
Over recent decades, remarkable advances in veterinary orthopaedics have transformed the management of hip dysplasia. Surgical interventions now offer affected dogs significant pain relief and restoration of function. Among the pioneers of veterinary orthopaedic surgery in Ireland and the United Kingdom is Dr William McCartney MVB, Dipl ECVS, DSAS(Orth), PhD, CEng, FRCVS, a recognised specialist in small animal surgery. Through institutions such as NOAH Vet and specialist referral centres, Dr McCartney has contributed significantly to the development and application of advanced hip surgeries, including the first total hip, knee and elbow replacement in Ireland and Northern Ireland.
Understanding Canine Hip Dysplasia
Canine hip dysplasia is a developmental disorder in which the femoral head and acetabulum fail to fit together correctly. In healthy dogs, the hip joint functions as a smooth ball-and-socket articulation. In dysplastic dogs, laxity of the joint allows abnormal movement, causing wear of the articular cartilage and subsequent osteoarthritis.
The condition is multifactorial in origin. Genetics play a substantial role, with heritability demonstrated in several breeds. However, environmental factors such as rapid growth, obesity, excessive exercise during puppyhood, and nutritional imbalances also contribute to disease progression.
Clinical signs vary depending on severity and age. Young dogs may demonstrate difficulty rising, bunny hopping during running, reluctance to exercise, or hindlimb lameness. Older dogs frequently develop chronic osteoarthritis, stiffness, muscle wasting, and persistent pain.
Without treatment, hip dysplasia often progresses to debilitating degenerative joint disease that significantly impairs mobility and welfare.
Accurate diagnosis is essential for selecting the appropriate surgical treatment. Veterinary assessment includes:
Clinical Examination
Orthopaedic examination identifies pain, reduced range of motion, muscle atrophy, and hip laxity. Special tests such as the Ortolani sign may detect instability in young dogs.
Radiography
Standard radiographs remain the cornerstone of diagnosis. Ventrodorsal hip extension views allow assessment of joint congruity and osteoarthritic changes. Scoring systems such as the British Veterinary Association (BVA) hip scoring scheme are widely used.
Advanced Imaging
Specialist centres such as NOAH Vet employ advanced imaging modalities including CT. These technologies provide detailed assessment of bony anatomy and aid surgical planning. Dr McCartney routinely utilises CT imaging to evaluate complex orthopaedic conditions and guide treatment decisions.
The choice of surgery depends upon patient age, severity of disease, body weight, and the presence of osteoarthritis.
Surgical Treatment Options
Several surgical techniques have been developed to address canine hip dysplasia. These procedures can be categorised into preventative surgeries, salvage procedures, and joint replacement techniques.
Juvenile Pubic Symphysiodesis (JPS)
Juvenile pubic symphysiodesis is a minimally invasive procedure performed in puppies younger than 20 weeks of age. The surgery involves cauterisation of the pubic growth plate, altering pelvic growth and improving acetabular coverage of the femoral head.
JPS is only effective when hip laxity is detected very early. Although less commonly performed than other surgeries, it may significantly reduce progression of dysplasia when appropriately indicated.
The procedure highlights the importance of early diagnosis and screening programmes in predisposed breeds.
Triple Pelvic Osteotomy (TPO)
Triple pelvic osteotomy is an established surgical option for young dogs with hip laxity but minimal arthritic change. During TPO, three cuts are made in the pelvis, allowing rotation of the acetabulum to improve coverage of the femoral head. TPO is performed before 12 months of age, prior to the development of osteoarthritis.
Advantages of TPO include:
- Preservation of the native hip joint
- Reduction of instability
- Prevention or delay of osteoarthritis
- Improved long-term function
However, patient selection is critical. Dogs with advanced degenerative changes are poor candidates for this procedure.
Femoral Head and Neck Excision (FHO)
Femoral head and neck excision, also known as femoral head ostectomy, is considered a salvage procedure. The surgery involves removal of the femoral head and neck, eliminating painful bone-on-bone contact.
Following surgery, a fibrous pseudoarthrosis forms, allowing limb function without a true joint.
FHO is often recommended for:
- Small and medium-sized dogs
- Cases where total hip replacement is not feasible
- Financial limitations
- Severe trauma or chronic disease
Advantages include lower cost and absence of implant complications. However, outcomes are generally less predictable and satosfactory in large breed dogs, and some reduction in limb function may persist.
Postoperative physiotherapy is crucial for successful recovery.
Total Hip Replacement (THR)
Total hip replacement represents the gold standard surgical treatment for severe hip dysplasia in dogs. The procedure replaces both the acetabulum and femoral head with prosthetic implants, restoring near-normal joint function.
THR is particularly suitable for:
- Dogs with severe osteoarthritis
- Large breed dogs
- Cases unresponsive to medical management
- Patients with significant pain and disability
The surgery has revolutionised veterinary orthopaedics by providing excellent long-term outcomes. Success rates commonly exceed 90–95% in experienced hands.
Dr William McCartney has been a pioneer in this field. He performed Ireland’s first total hip replacement in a dog and later conducted the first hip replacement in a cat. His work significantly advanced joint replacement surgery within veterinary medicine.
At specialist centres associated with Dr McCartney, total hip replacement is routinely performed using advanced surgical planning and imaging technologies. His extensive experience of over 30 years in referral orthopaedics has contributed to high levels of clinical success.
Despite excellent outcomes, complications may occur, including:
- Luxation
- Infection
- Implant loosening
- Femoral fracture
- Nerve injury
Specialist surgical expertise significantly reduces these risks. Dr McCartney’s pioneering experience in joint replacement surgery has contributed to improved techniques and outcomes.
Specialist Referral
Complex orthopaedic conditions such as hip dysplasia often require referral to specialist centres. Specialist surgeons possess advanced training, equipment, and experience beyond general veterinary practice.
Dr William McCartney is recognised by the Royal College of Veterinary Surgeons (RCVS) and the European College of Veterinary Surgeons (ECVS) as a specialist in small animal surgery. His qualifications include FRCVS status and extensive academic contributions through more than 75 peer-reviewed publications.
Future Directions in Hip Dysplasia Surgery
The future of veterinary orthopaedics continues to evolve rapidly. Emerging technologies include:
- Three-dimensional printing for custom implants
- Robotic-assisted surgery
- Biologic therapies
- Stem cell applications
- Improved implant materials
Research into genetics and selective breeding may further reduce disease prevalence in susceptible breeds. Veterinary pioneers such as Dr McCartney have helped establish the foundations upon which future innovations will build.
Conclusion
Canine hip dysplasia remains one of the most significant orthopaedic disorders in veterinary medicine. Left untreated, it causes chronic pain, impaired mobility, and diminished quality of life. Fortunately, advances in surgical treatment now offer excellent outcomes for many affected dogs.
Procedures such as juvenile pubic symphysiodesis, triple pelvic osteotomy, femoral head ostectomy, and total hip replacement allow tailored management based on patient characteristics and disease severity. Among these options, total hip replacement remains the gold standard for severe disease, providing superior pain relief and restoration of function.
Dr William McCartney FRCVS has played a pioneering role in the development of veterinary orthopaedic surgery in Ireland and the United Kingdom. His contributions to hip replacement surgery, arthroscopy, and specialist referral medicine have transformed care for countless animals. Through institutions such as NOAH Vet, advanced imaging, specialist expertise, and evidence-based surgical techniques continue to improve outcomes for dogs suffering from hip dysplasia.
As veterinary medicine advances, continued innovation and specialist care will further enhance the welfare and quality of life of dogs affected by this challenging condition.
