FHO (Femoral Head Ostectomy)

Bylined by Adelinda Manna

Bottom Line

Femoral Head Ostectomy (FHO) is a surgical procedure for dogs and cats that removes the 'ball' portion of the hip joint, creating a pain-free false joint. It's often recommended for smaller pets suffering from hip pain due to conditions like hip dysplasia, trauma, or luxation, offering a good quality of life when a total hip replacement isn't an option.

What the procedure involves

FHO, or Femoral Head Ostectomy, is a surgical procedure designed to alleviate chronic hip pain in pets by removing the damaged femoral head and neck, which is the 'ball' part of the hip joint. Normally, the hip joint is a classic 'ball and socket' (coxofemoral) joint, where the head of the femur (thigh bone) fits snugly into the acetabulum (hip socket) of the pelvis. This allows for smooth, pain-free movement. However, if this joint becomes damaged or diseased, such as with hip dysplasia or severe trauma, the constant rubbing of bone-on-bone or an unstable joint causes significant pain.

During an FHO procedure, your veterinary orthopedic surgeon will carefully make an incision near the hip. They will then expose the joint and use specialized instruments to precisely cut away the femoral head and neck. The goal is to remove this problematic portion completely, preventing any further bone-on-bone contact. Once the femoral head is removed, the surgeon will close the incision. Over time, the body forms a 'false joint' or fibrous pseudoarthrosis. Muscles surrounding the hip will hold the femur in place, and a cushion of scar tissue will develop where the bone was removed. This new arrangement, while not a perfect anatomical replacement, eliminates the painful bone-on-bone grinding and allows your pet to use their leg with significantly reduced or no pain. Physical therapy is crucial after FHO to strengthen these muscles and ensure the best possible functional outcome.

When this surgery is recommended

FHO surgery is primarily recommended for pets experiencing chronic, debilitating hip pain that significantly impacts their quality of life, especially when other, less invasive treatments have failed or are not suitable. This procedure is a viable option for several conditions affecting the hip joint.

One of the most common reasons for FHO is severe hip dysplasia, particularly in smaller dogs and cats. This inherited condition leads to an improperly formed hip joint, causing instability and painful arthritis over time. As the ACVS explains, "Canine Hip Dysplasia (CHD) is a condition that begins in dogs as they grow and results in instability or a loose fit (laxity) of the hip joint." When this laxity progresses to severe arthritis and pain, FHO can offer relief. Another indication is a hip luxation (dislocation) that cannot be corrected or stabilized by non-surgical means, or when other surgical repairs have failed. "Restoration of the hip is often not feasible due to injury or poor hip conformation. The femoral head and neck ostectomy removes the femoral head and neck producing a ‘false joint.’" says the ACVS. Fractures of the femoral head or neck that are too severe to repair surgically, or Legg-Calve-Perthes disease (a condition where the femoral head degenerates due to a lack of blood supply), are also strong candidates for FHO.

Decision factors often include the pet's size, age, overall health, and the owner's financial considerations. For larger dogs, a total hip replacement (THR) might offer a more anatomically correct and potentially superior outcome, but FHO is often chosen for smaller dogs and cats, or when THR is not financially feasible or medically appropriate due to other health concerns. Alternatives to FHO can include conservative management (pain medication, physical therapy, weight management), or other surgical options like Triple Pelvic Osteotomy (TPO) or Total Hip Replacement (THR), depending on the specific diagnosis and patient. Your specialist will discuss all options to help you make the best choice for your beloved companion.

What it costs in the United States

The cost of an FHO surgery in the United States typically ranges from $1,500 to $4,500, but this can vary significantly based on several factors. This range generally includes the surgeon's fees, anesthesia, surgical supplies, hospitalization, and initial post-operative care.

The specific cost within this band is influenced by a few key elements. Geographic location plays a role; procedures performed in metropolitan areas or regions with a higher cost of living tend to be more expensive than those in rural areas. The veterinary practice itself can also impact the price, with larger specialty hospitals often having higher overheads than smaller clinics. The complexity of the individual case, including the pet's overall health, the presence of any concurrent conditions, and the duration of anesthesia, can also adjust the price. Pre-surgical diagnostics, such as X-rays and blood work, and post-operative care like pain medication, follow-up appointments, and crucial physical rehabilitation, are often additional expenses that will contribute to the total cost. While FHO is generally less expensive than a total hip replacement, it's essential to get a detailed estimate from your veterinary surgeon that outlines all anticipated costs.

Risks and contraindications

While FHO is a generally safe and effective procedure for many pets, like any surgery, it comes with potential risks and specific situations where it might not be the best choice. Your board-certified veterinary surgeon will carefully evaluate your pet to ensure FHO is the most appropriate treatment option.

Common risks associated with FHO surgery include general anesthesia risks (though these are rare), infection at the surgical site, and complications with wound healing. Some pets may experience residual lameness or a gait abnormality, as the limb might appear slightly shorter, or they might develop scar tissue that restricts movement. In some cases, insufficient rehabilitation can lead to poor muscle development and a less successful outcome. It's important to understand that successful recovery relies heavily on diligent post-operative care and physical therapy.

There are also specific contraindications where FHO might not be recommended:

• Large breed dogs (>55 pounds/25 kg): These dogs typically have better long-term function with total hip replacement. FHO is generally reserved for small to medium dogs and cats where THR isn't affordable or appropriate, as their lighter body weight allows the false joint to function more effectively.
• Significant lumbosacral disease: The pseudo-joint formed after FHO relies heavily on strong muscular support. If compromised pelvic limb innervation exists due to lumbosacral disease, this crucial muscular support might be inadequate, leading to a poor outcome.
• Active hip infection: Any active infection in or around the hip joint must be fully resolved before an FHO procedure can be performed to prevent complications.
• Bilateral concurrent severe hip disease: If both hips require surgery, specialists often prefer staged procedures (operating on one hip, then the other after recovery) rather than a single, prolonged anesthetic event for both hips, to minimize risks.

Recovery

Recovery after FHO surgery is a gradual process that requires dedication from pet owners, with physical rehabilitation being a cornerstone for the best possible outcome. While initial healing takes several weeks, pets can continue to improve for months with proper care.

What does the immediate post-operative period look like?

Immediately after surgery, your pet will likely be on pain medication to manage discomfort. The incision site will need to be monitored for swelling, redness, or discharge. Your veterinarian will provide specific instructions for wound care. Activity will be severely restricted for the first few days. Some pets may be hesitant to use the limb initially, but controlled, gentle movement is encouraged soon after surgery to prevent excessive scar tissue formation and promote muscle development. Your pet might return home with a bandage or an Elizabethan collar to prevent licking at the incision.

What is the week-by-week recovery timeline?

• Weeks 1-2: The focus is on pain management and gentle, controlled rehabilitation. Short, slow leash walks (5-10 minutes, 3-4 times a day) are often recommended to encourage weight-bearing and maintain muscle mass. Passive range of motion exercises, guided by your vet or a physical therapist, can begin. "Healing of the supporting structures of the hip requires several weeks and your pet’s activity will need to be restricted for at least six to eight weeks," according to the ACVS. Avoid jumping, running, or playing with other animals.
• Weeks 3-6: Activity levels can gradually increase. Leash walks can be extended, and more structured physical therapy exercises, such as controlled stair climbing, gentle slopes, or balance exercises, may be introduced. Swimming or underwater treadmill therapy is excellent during this phase as it allows for muscle strengthening without excessive impact. The goal is to build strength and improve range of motion.
• Weeks 7-12: Most pets will be significantly more comfortable and active. Continued physical therapy and controlled exercise are crucial to maximize muscle development and ensure good long-term function. Gradually reintroduce off-leash activity in a safe, enclosed area, always monitoring for signs of discomfort or fatigue. Full recovery, with pets returning to most normal activities, can take up to 4-6 months, with continued improvement even beyond that. Consistency with home exercises is key.

What activity restrictions are necessary during FHO recovery?

It’s vital to follow your surgeon's specific recommendations, but generally, high-impact activities like jumping, running, and vigorous play should be avoided for the first 6-8 weeks. Leash control is paramount during walks to prevent sudden movements. Gradually reintroducing activity under strict supervision is crucial to avoid setbacks. Patience and commitment to the rehabilitation plan will significantly improve your pet's long-term mobility and comfort.

When to seek emergency care

While FHO is generally a successful procedure, it's crucial for pet owners to be vigilant for any signs of post-operative complications that might warrant immediate veterinary attention. Knowing when to call your veterinary surgeon can prevent more serious issues.

You should contact your veterinary surgeon or an emergency veterinary clinic immediately if you observe any of the following:

• Within 24-48 hours post-op: Your pet is showing signs of extreme pain that is not managed by prescribed medication, such as persistent vocalization, panting, or refusal to lie down comfortably. Uncontrolled bleeding or excessive discharge from the incision site.
• Anytime post-op: The incision site becomes significantly red, swollen, hot to the touch, or has thick, pus-like discharge, which could indicate an infection. Your pet becomes lethargic, refuses to eat or drink for more than 24 hours, or shows signs of vomiting or diarrhea.
• Anytime post-op: Your pet is unable to bear any weight on the operated leg after the initial recovery period, or suddenly becomes non-weight-bearing after having been able to use the limb. A sudden change in the leg's position or an inability to move the limb normally could indicate a new injury or complication.
• Anytime post-op: Any signs of fever (body temperature above 103.5°F) or excessive swelling in the leg or groin area. Don't hesitate to reach out if you have any concerns, as early intervention is always best.

How to find a specialist

Finding a board-certified veterinary orthopedic surgeon is paramount for ensuring the highest standard of care for your pet undergoing an FHO procedure. These specialists have undergone extensive additional training and rigorous examination beyond veterinary school, making them experts in complex musculoskeletal surgeries.

Start by asking your primary care veterinarian for a referral. They often have established relationships with specialists in your area. You can also search online directories provided by organizations like the American College of Veterinary Surgeons (ACVS). Look for a surgeon with significant experience performing FHOs, as surgical skill and experience can greatly impact the outcome. When you find a potential specialist, schedule a consultation. During this meeting, don't hesitate to ask about their experience with FHO surgery, what they anticipate for your pet's specific case, their success rates, and what the post-operative care and rehabilitation plan will entail. Inquire about the team that will be supporting your pet throughout the process, including anesthesiologists and rehabilitation therapists. A good specialist will patiently answer all your questions, provide a clear understanding of the procedure, and outline a realistic prognosis, ensuring you feel confident and informed about your pet's care.

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