What Is a Femoral Head Ostectomy?

A femoral head ostectomy in dogs is an operation that removes the ball of the hip joint instead of repairing it. The surgeon cuts away the femoral head and the short neck of bone beneath it, leaving the socket empty. Muscle and scar tissue fill the space and form a false joint that carries the limb. The aim is not a normal hip. The aim is a hip that does not hurt.

That trade is the entire point of the procedure, and it is where most owner confusion begins. Nothing is implanted. Nothing is reconstructed. Pain in an arthritic, dislocated or fractured hip comes from two damaged bone surfaces grinding against each other under load, so taking one of those surfaces away removes the source of the pain. What is left behind works remarkably well in cats, small dogs and many lean medium dogs. It works less predictably in heavy, large-breed animals.

This article covers what the surgery involves, which patients it suits, how it compares with a total hip replacement, what recovery genuinely looks like week by week, and the single post-operative instruction owners most often get wrong.

What to Know A femoral head ostectomy removes the femoral head and neck and allows a fibrous false joint to form in their place. It is a salvage procedure for pain, not a reconstruction. The limb ends up slightly shorter with reduced hip extension and some permanent loss of muscle bulk. Cats, small dogs and lean medium dogs usually do very well. Heavy large-breed dogs are less predictable, and a total hip replacement gives better mechanical function where it is available and affordable. Early controlled movement is essential, because strict cage rest after this particular surgery produces a stiff, poorly functioning limb. Sudden non-weight-bearing lameness, a hot swollen wound, discharge or a dragging hind leg after surgery needs veterinary attention the same day.

What Actually Happens During a Femoral Head Ostectomy?

The surgery is usually described by its initials, FHO, and sometimes by the more accurate name femoral head and neck excision. The longer name is better because it tells you that the neck of the femur comes out as well as the head. Leaving neck behind is the commonest technical reason the operation fails to relieve pain.

The patient is placed under general anaesthesia and the hip is approached from the outside of the thigh, in front of the greater trochanter. The muscles are separated rather than cut wherever possible. The joint capsule is opened, the round ligament holding the femoral head into the socket is released, and the head is lifted out of the acetabulum. With the head mobile, the surgeon uses a saw or an osteotome to cut across the femur from the base of the greater trochanter down to the lesser trochanter, angling the cut so that no bony shelf or spur is left standing. The head and neck come out as one piece.

The cut surface is then checked by feel and by eye. A smooth, flush cut sitting below the rim of the socket is what allows soft tissue to settle between bone and bone. A residual spike of neck, or a cut left too high and too flat, leaves bone that can still contact the pelvis when the dog loads the leg, and that contact hurts. Some surgeons fold a flap of local muscle into the gap as a cushion; the evidence for whether this changes the final result is mixed, and surgeon preference varies.

The terminology trips people up, because the words are used loosely. An ostectomy means bone is removed. An osteotomy means bone is cut and usually repositioned, as in a pelvic osteotomy performed on young dogs with hip laxity. Those are different operations with different goals, and owners who have read about one sometimes arrive expecting the other.

The wound is closed in layers, the dog recovers from anaesthesia with pain relief already on board, and in most cases goes home the same day or the next morning. There is no cast, no external frame and no implant to protect, which is one reason the aftercare instructions differ so sharply from those for a fracture repair.

Why Would a Dog Need the Hip Joint Removed?

The procedure is a salvage option. It gets chosen when the joint is beyond saving, or when saving it is not realistic for that patient, that household or that budget.

Road traffic injuries deserve a mention of their own in an Indian city. A large share of the hip trauma we see in Bengaluru arrives after a collision, and the fracture patterns through the femoral head and neck are frequently too comminuted to plate or pin with any confidence. An FHO in that setting is not second best. It is often the most reliable way to get a young, otherwise healthy dog walking again without a second operation six weeks later.

Hip dysplasia is a different conversation. It is common in the large pedigree breeds popular here and relatively uncommon in Indian pariah-type dogs, and it is a disease of the growing joint that declares itself later as arthritis. Many dysplastic dogs never need surgery at all, because weight control, measured exercise, physiotherapy and anti-inflammatory medication hold the pain at a level the dog tolerates for years. Surgery enters the discussion when that package stops working, not at the moment of diagnosis on a radiograph.

How Does It Compare With a Total Hip Replacement?

These two operations solve the same problem in opposite ways. A replacement rebuilds the joint with an implanted cup and stem and restores something close to normal mechanics. An ostectomy abolishes the joint and accepts altered mechanics in exchange for simplicity.

The asymmetry at the bottom of that table matters more than owners expect. A hip replacement that fails can be converted into an ostectomy. An ostectomy cannot be converted back into a good replacement easily, because the bone landmarks and soft tissue the implant relies on have gone. If a dog is a realistic candidate for a replacement, and the family can reach a centre that performs them, that conversation should happen before the ostectomy, not after it.

The honest counterweight is that a well-executed ostectomy in the right patient produces a comfortable, active animal, and comfort is what the owner actually came in for. A thin terrier with a collapsed femoral head does not need restored biomechanics. It needs to stop hurting, and this operation does that cheaply and durably.

Do Body Weight and Size Change the Result?

Size is the strongest single predictor of how well the leg works afterwards, and it is the part of the consultation where plain speaking helps most.

Cats do extremely well. Small dogs do extremely well. The false joint has to carry comparatively little load, the surrounding musculature is proportionally strong, and most of these patients end up with a gait their owners describe as normal. Medium dogs sit in a wide middle band and depend heavily on how lean and how well-muscled they are.

Large and giant breeds are the group to be cautious about. A heavy dog loads the pseudoarthrosis with every stride, and the result is more often a functional leg with a visible gait change than an invisible recovery. Expect reduced hip extension, a shortened stride on that side, and some permanent loss of thigh and rump muscle. Many of these dogs are nonetheless far more comfortable than they were before surgery, which is a real success even when the gait is imperfect.

Body condition is the one variable an owner can change, and it changes the outcome more than almost anything a surgeon does. Every spare kilogram passes through the false joint. A dog brought down to a lean body condition before surgery, and kept there afterwards, uses the limb better, rebuilds muscle faster and holds that function for longer. If the dog is overweight at diagnosis and the hip is being managed medically for now, weight loss is the single most useful thing to do in the waiting period.

What Does Recovery Actually Look Like?

Recovery after an FHO follows a sequence of milestones rather than a fixed calendar. The pattern below is typical. Individual dogs move through it faster or slower depending on size, condition and how consistently the home exercises happen.

The first fortnight is the part owners find hardest, because a dog that was walking on three legs before surgery is still walking on three legs after it. That is expected. The false joint does not exist yet. It is being built out of the tissue around the cut, and it forms in response to being used.

Muscle is slower than function. A dog can be using the leg well at eight weeks and still have an obviously thinner thigh on that side at six months. Some of that bulk comes back with work. Some of it does not.

Why Is Cage Rest the Wrong Instinct Here?

This is the instruction owners most often get wrong, and getting it wrong costs the dog function. Almost every orthopaedic operation an owner has heard about comes with weeks of confinement, so that is what they expect. After a femoral head ostectomy, enforced stillness works against the result.

The false joint is made of fibrous tissue that organises itself along the lines of force passing through it. Those lines only exist when the dog moves. A limb kept immobile for six weeks lays down disorganised scar in a shortened position, and what you get at the end is a stiff hip with restricted extension and a dog that has learned over a month and a half not to use the leg. That learned disuse is a real and separate problem from the surgery itself.

What is needed instead is controlled movement from the first days. Not freedom, and not stairs, jumping, rough play or slippery floors. Controlled means short, frequent, lead-held walking on a non-slip surface, passive flexing and extending of the hip while the dog lies relaxed, and standing exercises that ask the leg to take load for a few seconds at a time. The surgeon or physiotherapist should give a specific programme with session lengths and frequencies, and that programme should start before the sutures come out.

Restriction still applies to the activities that could dislodge healing tissue or cause a fall. The distinction is between rest and immobility. Rest the dog. Do not immobilise the hip.

What Can Go Wrong After the Surgery?

Most patients recover without incident. The problems that do occur fall into a short, recognisable list.

Persistent pain and lameness is the complication that matters most, and incomplete removal of the femoral neck is its most common cause. A residual spur of bone contacts the pelvis under load, the dog never settles, and resolving it means going back in to complete the ostectomy properly. This is why the quality of the bone cut, rather than the speed of the surgery, is what you are paying for.

Wound complications are usually minor. Seromas, which are soft fluid pockets under the skin, are common after surgery in this heavily muscled region and generally resolve without treatment. Infection is less common but needs recognising early: heat, firm swelling, discharge, a reopened incision or a dog that becomes dull and off its food.

Nerve injury is rare. The sciatic nerve runs close behind the hip, and bruising or traction on it during surgery can produce a temporary weakness that shows up as the dog scuffing or knuckling the paw. Most of these recover. A dog dragging the foot after surgery should be assessed rather than watched.

Muscle wastage in the thigh and rump is better described as an expected consequence than a complication, and it is worse in dogs that were lame for a long time before surgery and in those that do not get a rehabilitation programme. Reduced hip extension and a shortened stride on the operated side are likewise normal findings rather than failures.

A small number of dogs end up with a leg that is comfortable but never fully reliable at speed. In large breeds that is an outcome to anticipate out loud before surgery, not a surprise to explain afterwards.

How Should Rehabilitation Be Managed at Home?

The surgery is a single morning. The result is decided over the following three months, mostly in the house.

Flooring comes first, and in Indian homes it is the biggest avoidable risk. Polished granite, vitrified tile and cement all give a recovering dog no grip, and a hind leg that slides out from under a patient in the first fortnight is a genuine setback. Lay runners, yoga mats, old bedsheets or rubber matting along every route the dog uses, especially from the bed to the door. Block stairs with a gate. Lift small dogs, and use a towel sling under the belly of a large one on the first few trips outside.

Walks should be short and frequent rather than long and occasional. Five minutes four times a day achieves far more at week two than twenty minutes once. Keep the dog on a lead and on a surface with grip. Grass and packed earth are kinder than tarmac.

Bengaluru's weather shapes the schedule more than owners expect. Walk in the early morning and after sundown and avoid the middle of the day, because a dog that is panting and struggling with heat will not do its exercises properly and will load the sore leg badly. During the monsoon, check that the wound stays dry, dry the limb and the incision thoroughly after every wet walk, and be stricter than usual about slippery wet floors and compound gates.

Hydrotherapy and an underwater treadmill are available in the city and are genuinely useful once the wound has healed, because water lets the dog move the hip through a full range without taking full body weight. It is not essential. A disciplined home programme of lead walks, passive range of motion, sit-to-stand repetitions and gentle slope work gets most patients where they need to be.

Two further points matter as much as the walking programme. Give the prescribed pain relief for as long as it is prescribed, because a dog that hurts will not use the leg and a leg that is not used does not build a good false joint. Keep the dog lean permanently, not just during recovery. The pseudoarthrosis is the one part of this dog that will never get stronger with age, and body weight is the load it carries.

When Does a Dog Need Urgent Veterinary Attention After Surgery?

Some post-operative changes can wait until the next scheduled check. These cannot.

Any of these warrants a call to the hospital the same day. Do not add medication from your own cupboard while you wait, and never give human painkillers. Ibuprofen and paracetamol are both dangerous to dogs and paracetamol is lethal to cats, and a dog that has been given either arrives with two problems instead of one.

For a dog that has not yet had surgery, see a vet rather than waiting if a previously manageable hip becomes acutely painful, if the dog cannot stand, or if lameness follows a fall or a traffic accident. A fractured femoral head and a flare of arthritis feel similar from the outside and need radiographs to tell apart.

Frequently Asked Questions

Next Steps

If your dog has just had this surgery and has suddenly stopped using the leg, is dragging the paw, has a hot or discharging wound, or is dull and off food, telephone us the same day. The same applies to a dog that has not yet had surgery and is unable to stand, or whose lameness followed a traffic accident or a fall. Hip trauma needs radiographs, and a fracture through the femoral head looks much like an arthritic flare from the outside.

If the situation is not urgent, the useful next move is an assessment rather than a decision. Radiographs under sedation show what state the joint is actually in, and that determines whether medical management, a pelvic procedure in a young dog, a replacement or an ostectomy is the right conversation. Bring the dog lean if you can, because body condition changes both the surgical options and the eventual outcome.

Our orthopaedic team can examine the hip, take the images, talk through the realistic function to expect for your dog's size and breed, and set out a rehabilitation programme you can actually run at home. Book an examination and bring any previous radiographs or reports with you.