Hearing that your cat may need surgery on their hip can be very upsetting news. It’s not something most owners expect, and the terminology alone can be really confusing. One procedure you may come across is a femoral head ostectomy, more commonly shortened to FHO. Although it sounds complicated, this is a well-established surgery that can make a big difference to cats living with hip pain. In the right clinical situation, it can restore comfort and allow a good quality of life, even if the joint itself is permanently altered. Understanding what the procedure involves, why it’s recommended, and what recovery looks like can help you feel more prepared if your cat is facing this decision. Read on to find out more.  

What is FHO surgery? 

FHO stands for femoral head ostectomy. The operation involves removing the ball part of the ball-and-socket hip joint. In a normal hip, the rounded head of the femur (the thigh bone) sits within the socket of the pelvis. These surfaces move smoothly together, allowing comfortable movement. When the joint is damaged, however, that smooth movement is lost, and it can cause a considerable amount of pain for the cat. 

During an FHO, the head and neck of the femur are surgically removed. This removes the painful bone-on-bone contact within the joint. Over time, the body forms a fibrous “false joint” in its place. It doesn’t recreate a normal hip joint, but it can provide a comfortable, functional range of movement. Cats in particular, tend to adapt really well to this change. 

Why would a cat need an FHO? 

There are several reasons why your vet might recommend this surgery. Most of them relate to ongoing pain that can’t be successfully managed in other ways. 

One of the more common causes is trauma. Cats that have been involved in road traffic accidents or falls can sustain fractures to the femoral head or neck. In some cases, repairing the bone directly isn’t practical, and removing the damaged portion can often be the most reliable way to restore comfort and maintain a good quality of life.  

Another reason is hip luxation, where the joint becomes dislocated. If the joint cannot be stabilised successfully or if repeated dislocations occur, FHO may be considered. 

Less common conditions, such as hip dysplasia or severe arthritis, can lead to chronic pain in the joint. While these are seen more often in dogs, they do occur in cats, and when they do, they can be quite debilitating. There is also a condition called Legg-Calvé-Perthes disease, where the blood supply to the femoral head is disrupted, leading to bone degeneration. Again, this is rare in cats, but it is another situation where FHO may be appropriate. In all of these clinical scenarios, the common factor is pain that is affecting the quality of life. 

How do cats with hip problems present? 

Cats are often quite subtle when it comes to showing pain, which can make hip issues easy to miss early on. You may notice changes such as reduced jumping, hesitancy when climbing stairs, or a reluctance to be handled around the back end. Some cats can just become quieter or less interactive, while others may suddenly not like being touched at all. 

Lameness can be present, although it isn’t always obvious. In some cases, the only sign is a gradual loss of muscle over the affected limb. 

With more acute injuries, such as fractures or dislocations, the signs are usually more pronounced. These cats may be unable to bear weight, and the discomfort is often more clearly visible. 

How is the decision made to perform an FHO? 

The process usually starts with a clinical examination. Your vet will assess your cat’s movement, joint range, and areas of discomfort. Imaging plays an important role in confirming what is happening within the joint. X-rays are typically used to identify fractures, dislocations, or degenerative changes. In more complex cases, further imaging may be recommended. The decision to proceed with FHO is based on a combination of factors. These include the underlying cause, the level of pain, your cat’s overall health, and how likely other treatment options are to be successful. 

In some situations, alternative procedures may be discussed. However, in cats, FHO is often a very reliable option, particularly when the aim is to remove pain rather than restore perfect joint anatomy. 

What happens during the surgery? 

FHO is performed under general anaesthesia. The surgeon makes an incision over the hip and carefully removes the head and neck of the femur. Precision is important here. The aim is to remove enough bone to prevent contact with the pelvis, while preserving surrounding tissues that will support the formation of the false joint. Once the bone has been removed, the area is closed routinely. There is no implant placed, which is one of the reasons this procedure can be a good option in a range of situations. 

Your cat will receive pain relief throughout and after the surgery, and most will stay in the hospital for a short period while they recover from the anaesthetic and the vets can make sure they are comfortable. 

What does recovery look like? 

Recovery from FHO is often more about rehabilitation than the surgery itself. In the early days, rest and pain management are the main priorities. Your cat may initially be reluctant to use the leg, which is to be expected. Gradually, controlled movement is encouraged to help the body adapt and form the fibrous joint. 

Cats tend to do particularly well because of their size and natural agility. Encouraging gentle, normal movement within a safe environment is usually more beneficial than prolonged restriction. Over the following weeks, you should start to see increasing use of the limb. Muscle strength will gradually return, and most cats become more comfortable as healing progresses. 

It is important for owners to remember that recovery can take several weeks to a few months. The exact timeline varies, but patience during this stage is important. 

Will my cat walk normally again? 

This is one of the most common questions, and the answer is that while movement may not be identical to before, most cats regain very good function. Many return to jumping, climbing, and playing without any significant limitations. A slight change in gait can sometimes be seen, particularly in the early stages, but this often becomes less noticeable over time. 

The key outcome is comfort. Removing the source of pain allows your cat to move more freely, even if the joint itself is different. 

What factors influence the outcome? 

Several factors can affect how well a cat does after FHO.  

  • Body weight plays a role. Cats that are a healthy weight tend to recover more easily, as there is less strain on the limb during healing. 
  • Muscle condition is also important. Cats that have had long-standing problems may have more muscle loss, which can take time to rebuild. 
  • The underlying cause matters too. Acute injuries often have a more straightforward recovery compared to chronic conditions, where changes have been present for some time. 
  • The level of post-operative care and rehabilitation makes a difference. Encouraging appropriate movement and following veterinary advice can have a significant impact on the final outcome. 

Are there any risks or complications? 

As with any surgery, there are potential risks, although serious complications are relatively uncommon. Infection is a possibility, as with any surgical procedure, but this is usually well controlled with standard precautions. Some cats may be slower to regain full use of the limb, particularly if they are reluctant to move. In these cases, additional support such as physiotherapy can be helpful. 

Very occasionally, there may be ongoing discomfort or reduced function, but this is not typical. Overall, FHO is considered a safe and effective procedure, particularly in cats. 

Is physiotherapy needed? 

Physiotherapy can be very beneficial, although it isn’t always essential and it does depend on the temperament of your cat. Small changes at home, such as encouraging gentle movement and avoiding prolonged confinement, are often enough for many cats. In cases where recovery is slower, structured physiotherapy or hydrotherapy may be recommended. The aim is to rebuild muscle strength and improve range of motion over time.  

How does FHO compare to other surgical options? 

In dogs, particularly larger breeds, more complex procedures such as total hip replacement may be considered. In cats, this is less commonly performed. 

FHO tends to be the preferred option in many feline cases because of their smaller size and ability to adapt. It is also less technically demanding than joint replacement and does not involve implants. The decision is always individual, but in practice, FHO is often the most practical and effective choice for cats with significant hip pain. 

What is the long-term outlook? 

The long-term outlook for cats undergoing FHO is generally very good. Most go on to live comfortable, active lives without the chronic pain they experienced before surgery. While the joint is no longer anatomically normal, it functions well enough for everyday activity. Ongoing management is usually minimal once recovery is complete, although maintaining a healthy weight remains important. 

Supporting your cat through the process 

If your cat is facing FHO surgery, there are a few practical steps that can help. 

Creating a calm, safe recovery space at home makes a difference. Limiting access to high surfaces initially can help prevent overexertion in the early stages. Monitoring appetite, behaviour, and mobility during recovery allows you to spot any concerns early. Follow-up appointments are an important part of the process, as they allow your vet to assess progress and adjust the plan if needed. 

It’s also worth remembering that cats often recover in their own time. Some adapt very quickly, while others take a little longer to regain confidence in using the limb. 

Final thoughts 

FHO surgery is not about restoring a perfect hip joint. It’s about removing pain and allowing your cat to move comfortably again. Removing part of a joint can sound daunting, but in practice, most cats tolerate the procedure very well. With the right support and a bit of patience during recovery, many return to a good quality of life. 

If you’re unsure whether it’s the right option for your cat, having a frank discussion with your vet can help clarify what to expect and what the likely outcome will be in your individual situation.