When Conservative Management Is No Longer Enough
When a large-breed dog with severe hip dysplasia can no longer rise from a lying position without visible pain, and NSAIDs, rehabilitation, and weight management have stopped providing adequate relief, the conversation turns to total hip replacement. THR achieves excellent or good function in 90-95% of appropriately selected cases, with implant survival exceeding 10 years — outcomes that rival human orthopedic benchmarks.
It is a specialist procedure, performed by board-certified veterinary surgeons at referral centers, and it is not appropriate for every dog with hip disease. But for the right candidate, THR transforms quality of life in a way no other intervention can match.
Indications: Who Is a Candidate?
THR is most appropriate for dogs with:
- Severe hip dysplasia causing significant lameness and reduced quality of life
- Failed medical management (NSAIDs, rehabilitation, weight management no longer providing adequate comfort)
- OFA grade Moderate or Severe hip dysplasia with corresponding clinical signs
- End-stage hip osteoarthritis
- Femoral head and neck fractures not amenable to repair
Weight and size: THR is typically performed in dogs over 15–20 kg (33–44 lbs); smaller dogs are candidates for femoral head and neck excision (FHNE) as an alternative.
Contraindications:
- Active infection in or near the hip joint
- Severe neurological dysfunction affecting the hindlimb
- Severe muscle atrophy (undermines implant stability post-operatively)
- Immunosuppressive disease
- Very young dogs (skeletal immaturity; typically must be skeletally mature)
Alternative Procedures
Femoral Head and Neck Excision (FHNE/FHO): removes the femoral head entirely; joint is replaced by fibrous scar tissue. Lower cost, lower complication risk, but inferior functional outcomes to THR — particularly in larger dogs. Appropriate for small dogs and as salvage for failed THR.
Triple/Double Pelvic Osteotomy (TPO/DPO): rotates the acetabulum to improve coverage of the femoral head. Performed in young dogs (typically <10 months) before significant osteoarthritis develops; not appropriate once arthritis is established.
Medical management: NSAIDs, rehabilitation, omega-3 supplementation, weight control — appropriate first-line and as long-term adjunct, but not a substitute for THR in severely affected dogs.
The THR Procedure
Performed under general anesthesia at a specialist referral center. Duration: approximately 1.5–2.5 hours per hip.
Implant systems used in veterinary medicine:
- BioMedtrix CFX (cemented): PMMA bone cement anchors components; suitable for most anatomies; well-established long-term data
- BioMedtrix BFX (cementless): press-fit porous-coated components that osseointegrate (bone grows into the implant surface); no cement; requires precise sizing
- Zurich Cementless System: alternative cementless system; favorable outcomes data
- Micro Total Hip (for smaller dogs): adapted systems for medium-sized dogs
Bilateral THR: both hips affected in many dogs with hip dysplasia. Bilateral surgery is performed as staged procedures (one hip at a time), typically 6–8 weeks apart. The second surgery is performed after the first hip has achieved adequate function.
Outcomes
Published outcomes for canine THR are very good:
- Excellent or good function: 90–95% of appropriately selected cases
- Return to near-normal gait: typical at 3–6 months post-operatively
- Long-term implant survival (10+ years): >90% in most series for cementless systems
Major complications (occur in approximately 5–10% of cases):
- Luxation (hip dislocation): most common early complication; often manageable with closed reduction but may require revision surgery
- Infection: most serious complication; typically requires implant removal
- Femoral fracture: rare; associated with implant placement or post-operative trauma
- Sciatic nerve injury: rare; typically resolves
Complication risk is surgeon-experience-dependent: THR complication rates are significantly lower at high-volume referral centers with experienced surgeons. Surgeon-specific complication rates are appropriate to ask about before proceeding.
Recovery Protocol
THR recovery is more prolonged than most orthopedic procedures due to the need for implant integration and hip muscle rehabilitation.
Weeks 1–6: strict activity restriction; leash walks only (5–10 minutes, 3–4x daily); carry on stairs; use of a sling under the hindquarters for stability; physical therapy begins within the first 1–2 weeks (passive range of motion, controlled walking)
Weeks 6–12: gradual walk duration increase; underwater treadmill hydrotherapy for muscle conditioning without joint loading; controlled hill walking
Week 8–10: radiographic recheck to assess implant positioning and osseointegration
Months 3–6: progressive return to normal activity; off-lead activity when cleared by surgeon
Long-term: most dogs return to full normal activity including running, stairs, and play. Annual radiographic monitoring is appropriate to detect implant wear or loosening over years.
Cost Considerations
THR is among the highest-cost elective orthopedic procedures in veterinary medicine. Per-hip costs at US referral centers typically range from $4,500–$7,000 including surgery, implants, hospitalization, and immediate post-operative care. Bilateral THR costs accordingly more.
Pet insurance coverage for THR varies significantly by policy — pre-existing conditions (including previously diagnosed hip dysplasia) are frequently excluded. Verify coverage before committing to surgery.
Related Reading
For breed-specific joint screening protocols and post-surgical rehabilitation evidence, see Joint Screening Protocol by Breed and Canine Rehabilitation Post-Surgery.
Medical Disclaimer
This guide is for informational purposes only and does not constitute veterinary advice. Consult a board-certified veterinary surgeon for evaluation and recommendations specific to your dog.
Frequently Asked Questions
What is total hip replacement (THR) in dogs? Canine total hip replacement replaces both the acetabulum (hip socket) and femoral head with implants — similar to human hip replacement. The procedure eliminates the bone-on-bone contact of severe hip dysplasia or femoral head necrosis. THR is performed by veterinary orthopedic specialists and is considered the gold standard for dogs with advanced hip disease when they are otherwise good surgical candidates (>20–25 lbs, adequate bone stock, no infection).
What is FHO, and when is it chosen over THR? Femoral head and neck ostectomy (FHO) removes the femoral head entirely, allowing a fibrous false joint to form over 2–3 months. FHO is lower cost and technically less demanding than THR. It typically produces better outcomes in small dogs (<20 kg) where the fibrous joint is weight-bearing enough. In large dogs, FHO often results in a functional but clearly abnormal gait with variable pain outcomes. THR produces superior results in dogs >20 kg when feasible.
What is the success rate of canine THR? Major complication rates (implant loosening, infection, luxation requiring revision) are approximately 10–15% in published series. The vast majority of dogs with successful THR have excellent to good outcomes — reduced pain, improved mobility, and return to normal activity. Success depends on patient selection, surgical technique, implant quality, and post-operative management.
How long does recovery take after THR? Strict leash rest for 6–8 weeks. Short, controlled leash walks are gradually increased starting at 2–3 weeks. Radiographic assessment at 8–12 weeks guides return to activity. Most dogs can walk normally by 8 weeks, but running and jumping should be restricted for 3–4 months. Full recovery to athletic function is typically 4–6 months. The operated hip is stronger and more stable than the dysplastic hip it replaced.
Can dogs have THR on both hips? Yes. Bilateral THR can be performed — either simultaneously or as staged procedures (typically 6–12 weeks apart). Most surgeons prefer to stage bilateral cases to limit anesthetic time and monitor the first hip before operating on the second. Dogs with severe bilateral hip dysplasia can have dramatically improved quality of life with bilateral replacement.