FHO (femoral head ostectomy) is a surgical procedure that removes the ball portion of a dog’s hip joint to eliminate bone-on-bone pain. The surgeon cuts away the femoral head and neck, which is the rounded top of the thighbone that normally sits inside the hip socket. Over the following weeks, the dog’s body builds a cushion of dense scar tissue where the joint used to be, creating what veterinarians call a “false joint” or pseudoarthrosis. This scar tissue joint isn’t as mechanically perfect as the original hip, but it allows comfortable, functional movement without the grinding pain that made surgery necessary.
Why Dogs Need FHO Surgery
FHO is typically recommended when a dog’s hip joint has become a source of chronic pain that doesn’t respond to medication, rest, or weight management. The most common reasons include hip dysplasia (where the hip socket and femoral head don’t fit together properly), Legg-Calvé-Perthes disease (where blood supply to the femoral head deteriorates, causing the bone to collapse), and traumatic hip fractures or dislocations that can’t be repaired.
In all of these cases, the core problem is the same: damaged bone surfaces rubbing against each other inside the joint. Rather than trying to rebuild a functioning ball-and-socket joint, FHO takes a different approach. It removes one side of the equation entirely so there’s no more bone-on-bone contact to cause pain.
How the False Joint Forms
After the femoral head is removed, the remaining thighbone sits near the hip socket without touching it. During the healing period, the body fills this gap with dense fibrous tissue that acts as a natural cushion between the bones. This tissue eventually matures into a functional connection that supports the leg during movement.
The quality of this false joint depends heavily on what happens during recovery. Early, controlled use of the leg is critical because it shapes how the fibrous tissue develops. Dogs that begin bearing weight sooner tend to build a false joint with a better range of motion. Without consistent rehabilitation, the scar tissue can form in a way that limits flexibility or leaves the leg weaker than it needs to be.
Which Dogs Are Good Candidates
FHO works best in smaller, lighter dogs. Dogs under 30 to 50 pounds generally have the most favorable outcomes because there’s less body weight for the false joint to support. Small breeds with Legg-Calvé-Perthes disease, such as Yorkshire Terriers, Miniature Pinschers, and West Highland White Terriers, are among the most common FHO patients.
Larger dogs can still benefit from the procedure, but outcomes are less predictable. Heavier dogs place more mechanical demand on the false joint, which can lead to persistent lameness or reduced range of motion. For bigger breeds, total hip replacement is often the preferred option when it’s available and affordable. That said, FHO remains a viable pain-relief option for large dogs when total hip replacement isn’t feasible.
What Recovery Looks Like
Recovery from FHO follows a gradual progression over several months. In the first two weeks, your dog will likely keep weight off the surgical leg entirely. Sutures or staples are typically removed around 10 to 14 days after surgery, at which point the veterinarian will assess range of motion and check how much weight your dog is putting on the leg.
Most dogs begin “toe touching,” lightly placing the foot on the ground while standing, by around week two. From there, weight bearing gradually increases as the false joint develops. Activity levels should ramp up slowly, with the goal of returning to full, unrestricted activity by the end of 12 weeks.
For larger dogs or those with pre-existing arthritis in other joints, full recovery can take considerably longer, up to 12 months in some cases. The timeline varies from dog to dog, and pushing too hard too fast can be just as problematic as not encouraging enough movement.
Rehabilitation After Surgery
Physical rehabilitation plays a major role in how well a dog recovers from FHO. In the early stages, the focus is on gentle joint mobilization, where a therapist carefully moves the hip through its range of motion to prevent the scar tissue from becoming too stiff. As healing progresses, exercises become more active.
Common rehabilitation tools include physioballs and peanut-shaped rolls for balance work, cavaletti poles (low hurdles that encourage the dog to lift and flex the leg), wobble boards for core stability, and underwater treadmills that let dogs walk with reduced weight on the joint. Many surgical centers include a set number of rehabilitation sessions in the cost of the procedure. Home exercises, like short leash walks on flat ground and gentle range-of-motion stretches, are equally important between professional sessions.
Possible Complications
FHO reliably eliminates hip pain, but it does change the mechanics of the leg. Because the femoral head is removed, the thighbone sits slightly higher than it did before surgery. This can cause a small amount of limb shortening on the surgical side. Over time, the muscles on that leg may lose some bulk compared to the other side, particularly if the dog favors the limb during recovery.
Studies measuring how dogs walk after FHO have found that the treated leg produces lower peak forces during push-off compared to a normal leg. In practical terms, this means some dogs walk with a mild, persistent limp or slight gait change even after full recovery. The leg works, and the dog isn’t in pain, but the movement pattern isn’t identical to what it was before the hip deteriorated. For most owners, this trade-off is well worth eliminating chronic hip pain.
FHO Compared to Total Hip Replacement
Total hip replacement (THR) is the other major surgical option for severe hip problems. Where FHO removes the joint and relies on scar tissue, THR replaces the damaged ball and socket with artificial components, essentially giving the dog a new hip. Research shows that nearly all dogs treated with THR recover normal limb function, with treated legs returning to pre-surgical force levels within about four months.
THR generally produces better long-term biomechanical results than FHO, particularly in larger dogs. However, it’s a more complex surgery, requires specialized equipment and training, and costs significantly more. FHO remains a strong option for pain relief when THR isn’t available at a nearby surgical center, when cost is a limiting factor, or when the dog’s size makes it a good candidate for a false joint.
What FHO Surgery Costs
FHO is considerably more affordable than total hip replacement. Pricing varies by region and facility, but as a reference point, one veterinary surgical center lists all-inclusive FHO packages (covering X-rays, pain management, and six rehabilitation sessions) at roughly $2,000 to $2,100 for dogs under 30 pounds, $2,200 to $2,350 for dogs between 31 and 60 pounds, and $2,470 to $2,615 for dogs over 60 pounds. Some surgical variations that use an anchoring technique add around $300 to these figures. Costs at your local clinic may be higher or lower depending on geographic area and the complexity of your dog’s case.