Proximal Fibular Osteotomy

What is proximal fibular osteotomy?

A proximal fibular osteotomy is a surgical procedure in which a small segment of the fibula is removed near the knee. The fibula is the thinner of the two bones in the lower leg; it runs alongside the tibia (the shin bone) on the outer side of the leg. The word proximal means the part of the bone closest to the knee, and an osteotomy is a planned surgical cut through bone. In this operation, the surgeon removes a short section of the fibula, usually a few centimeters long, from its upper third.

The procedure is used mainly for people with medial compartment knee osteoarthritis. Osteoarthritis is the wear-and-tear form of arthritis in which the protective cartilage lining a joint gradually thins. The knee has an inner (medial) and an outer (lateral) compartment. When the inner compartment wears down more than the outer one, the leg often drifts into a bow-legged shape known as a varus deformity, and body weight is pushed even more heavily onto the already damaged inner side.

The idea behind proximal fibular osteotomy is that the fibula acts as a stiff support on the outer side of the lower leg. Removing a segment is thought to allow the outer side of the tibia to settle very slightly, which may shift some of the load away from the worn inner compartment and toward the healthier outer compartment. This is often described as a load-redistributing or unloading procedure. It is considered a relatively new technique, and it is not offered in every hospital or country. Many orthopedic surgeons regard it as an option that is still being studied rather than a standard first-line treatment.

Proximal fibular osteotomy is generally discussed alongside other knee-preserving surgeries, such as high tibial osteotomy (a procedure that cuts and realigns the tibia itself), and with joint replacement options such as partial or total knee replacement. In hospital groups such as Acibadem, this type of surgery is managed by the Orthopedics and Joint Center, where surgeons assess whether it is appropriate for an individual patient.

Who needs proximal fibular osteotomy: candidates and limits

Deciding who needs proximal fibular osteotomy depends on a careful assessment of the knee, the alignment of the leg, and the person’s overall health and goals. In general, surgeons consider the procedure for people who have the following features:

• Knee pain that is mainly on the inner side of the joint and that has not improved enough with non-surgical care such as weight management, physical therapy, activity changes, pain medicines, or injections.
• X-ray evidence of osteoarthritis concentrated in the medial compartment, with a relatively preserved outer compartment.
• A mild to moderate varus (bow-legged) deformity.
• A wish to delay or avoid knee replacement, or medical reasons that make a larger operation less attractive.
• A reasonably stable knee with intact ligaments and a good range of motion.

The procedure is usually not considered suitable in situations such as:

• Advanced arthritis affecting both compartments of the knee, or significant wear behind the kneecap.
• Inflammatory arthritis such as rheumatoid arthritis, where the joint lining rather than mechanical load is the main problem.
• Severe deformity or major ligament instability, where realignment or replacement may be more appropriate.
• Active infection, poor skin condition around the leg, or conditions that seriously impair bone or wound healing.
• Pre-existing weakness or nerve damage in the leg, because the operation carries a risk to a nearby nerve.

Your surgeon will typically use standing X-rays of the whole leg to measure alignment, and may request an MRI (magnetic resonance imaging, a detailed scan using magnets and radio waves) to look at cartilage, ligaments, and the menisci (the C-shaped cushions inside the knee). This information is combined with a physical examination and a discussion of your expectations before any recommendation is made.

How the proximal fibular osteotomy procedure works

The proximal fibular osteotomy procedure is generally shorter and less complex than realignment of the tibia or knee replacement, but it is still an operation on bone close to important nerves and blood vessels. The steps below describe what typically happens.

Before the operation. You will meet the surgical and anesthesia teams. The procedure is most often performed under regional anesthesia, such as a spinal injection that numbs the lower body, although general anesthesia (being fully asleep) may be used depending on your health and preferences. The skin over the outer side of the leg is cleaned and the correct leg is clearly marked.

During the operation. The surgeon makes a relatively small incision on the outer side of the upper leg, below the knee. The muscles are gently separated to reach the fibula. Surgeons deliberately choose a level that is a safe distance below the head of the fibula, because the common peroneal nerve (a nerve that controls lifting the foot and provides feeling to the top of the foot) wraps around the bone near the knee. A segment of fibula, commonly around two centimeters, is carefully cut out. The bone ends are usually left free; unlike many other osteotomies, no plates or screws are normally required. The wound is then closed with stitches or staples and a dressing is applied.

Immediately after. Most people spend a short time in a recovery area while the anesthesia wears off. The leg is checked to confirm that the foot and toes move normally and that sensation is intact. Many surgeons allow weight on the leg quite early, sometimes on the same day or the next day, because the fibula carries only a small share of body weight. A physical therapist will typically show you how to walk safely, often with crutches or a walker at first.

Preparation for proximal fibular osteotomy

Preparation begins several weeks before the operation and focuses on making surgery as safe as possible and setting up your recovery in advance.

• Medical review. Blood tests, an electrocardiogram (a recording of the heart’s electrical activity), and other checks may be requested depending on your age and health. Conditions such as diabetes or high blood pressure are best brought under good control beforehand.
• Medicines. Tell your team about every medicine and supplement you take. Blood thinners, certain anti-inflammatory drugs, and some herbal products may need to be paused; your doctor will advise you on timing.
• Smoking and alcohol. Smoking slows wound and bone healing and raises the risk of complications. Stopping, even for a few weeks around surgery, is widely recommended.
• Fasting. You will usually be asked not to eat or drink for a set number of hours before anesthesia.
• Home planning. Arrange for someone to take you home and to help during the first days. Clear walkways of loose rugs and cables, and think about where you will sit, sleep, and bathe.
• Skin care. Any cuts, rashes, or infections on the leg should be reported, as surgery may need to be postponed until they heal.

Recovery and aftercare: proximal fibular osteotomy recovery time

Proximal fibular osteotomy recovery time varies from person to person, but it is generally shorter than recovery from tibial realignment or knee replacement. The timeline below uses typical ranges; your own progress may be faster or slower.

• First few days. Some pain, swelling, and bruising around the incision are expected. Pain is usually managed with oral medicines. Keeping the leg elevated when resting and using ice packs as advised can help with swelling. Many patients walk with support within a day or two.
• First two weeks. The wound is checked and stitches or staples are typically removed around 10 to 14 days. Gentle exercises to maintain knee movement and ankle strength are usually encouraged.
• Weeks two to six. Many people gradually reduce their use of walking aids and return to light daily activities, desk-based work, and short walks. Physical therapy may focus on strengthening the thigh and calf muscles and on normal walking patterns.
• Beyond six weeks. Higher-impact activities are generally introduced slowly and only with your surgeon’s agreement. Some improvement in knee pain may be noticed early, while other people report change over several months.

Aftercare typically includes keeping the dressing clean and dry, watching for signs of infection, taking any prescribed medicine to reduce the risk of blood clots, and attending follow-up appointments where X-rays may be taken to check the bone ends and knee alignment. Driving is usually possible once you can safely control the pedals without strong pain medicine, which for many people is a matter of a few weeks; check with your doctor and local rules.

Proximal fibular osteotomy risks and benefits

Weighing proximal fibular osteotomy risks and benefits honestly is an important part of the decision. No operation is free of risk, and this one has some specific concerns because of its location.

Possible benefits

• A smaller incision and a shorter operation than tibial osteotomy or knee replacement.
• No implants are usually needed, so there is no hardware to irritate tissues or to remove later.
• Early weight bearing is often permitted, which may make the early recovery period easier.
• The knee joint itself is not opened or replaced, so future surgical options are generally preserved.
• Some people experience a reduction in inner-knee pain and an improvement in walking comfort.

Possible risks and side effects

• Nerve injury. The most discussed complication is damage to the common peroneal nerve or its branches. This can cause numbness or tingling on the outer leg or top of the foot, weakness lifting the foot or big toe, or, rarely, a condition called foot drop in which the foot cannot be lifted properly. Many nerve symptoms are temporary, but some can be lasting.
• Infection of the wound or, less often, of the bone.
• Bleeding or a collection of blood under the skin (a hematoma).
• Blood clots in the leg veins (deep vein thrombosis), which can occasionally travel to the lungs.
• Persistent or insufficient pain relief. Not everyone improves, and some people go on to need further surgery such as knee replacement.
• Ankle or lower-leg changes. Because the fibula contributes to ankle stability, some people report ankle discomfort, and surgeons monitor for this.
• Bone-related issues such as delayed healing of the cut ends, unwanted bone growth, or stress-related pain in the tibia.
• Anesthesia-related risks, which are generally low but depend on individual health.

Results and outlook

Published experience with proximal fibular osteotomy is still relatively limited compared with long-established procedures. Available studies, many of them from a small number of centers, generally report that a proportion of appropriately selected patients experience reduced medial knee pain and improved function in the months after surgery, and some imaging studies suggest a modest change in load distribution across the knee. However, follow-up in much of this research is short, study designs vary, and high-quality long-term comparisons with high tibial osteotomy or knee replacement are lacking. For this reason, many orthopedic organizations and surgeons consider the procedure promising but not yet fully proven.

Realistic expectations matter. The operation does not restore lost cartilage and does not cure osteoarthritis. Its goal is to make the knee more comfortable and to postpone, in some cases, the need for a larger operation. Results appear to be better when the arthritis is limited to the inner compartment and the deformity is mild to moderate. If arthritis continues to progress, knee replacement remains an option later, and having had a fibular osteotomy does not usually prevent it.

Cost considerations

The cost of proximal fibular osteotomy varies widely between countries, hospitals, and insurance arrangements, and it is not possible to give a meaningful universal figure. Factors that typically influence the total include:

• Pre-operative assessment, including consultations, X-rays, and any MRI or laboratory tests.
• Operating room and anesthesia fees, which are influenced by the type of anesthesia and the length of the procedure.
• Hospital stay, which is often short for this operation but may be longer if complications arise or if other health conditions need monitoring.
• Implants and devices. Because plates and screws are usually not required, this element is often smaller than for other knee osteotomies, although crutches, braces, or compression stockings may still be needed.
• Follow-up care, including wound checks, X-rays, and physical therapy sessions over several weeks or months.
• Insurance coverage. Since the procedure is considered newer, some insurers may treat it differently from established surgeries, so it is sensible to confirm coverage in advance.

The hospital’s financial or international patient office can usually provide an itemized estimate once a treatment plan has been agreed.

Frequently asked questions

What does a proximal fibular osteotomy involve?

It involves removing a short segment of the fibula, the thin bone on the outer side of the lower leg, from a level below the knee. The aim is to shift some weight-bearing load away from the worn inner part of the knee. The knee joint itself is not opened, and metal implants are usually not needed.

Who needs proximal fibular osteotomy?

It is generally considered for adults with osteoarthritis mainly in the inner compartment of the knee, a mild to moderate bow-legged alignment, and pain that has not responded adequately to non-surgical treatment. People with arthritis throughout the knee, inflammatory arthritis, severe deformity, or existing nerve weakness in the leg are usually not good candidates. Only a specialist assessment can determine suitability.

How long is proximal fibular osteotomy recovery time?

Recovery is often quicker than after larger knee operations. Many people walk with support within a day or two, return to light daily activities within several weeks, and gradually resume more demanding activities over a few months with their surgeon’s guidance. Individual recovery depends on age, general health, and how the knee responds.

What are the main proximal fibular osteotomy risks and benefits?

Benefits may include a smaller incision, no hardware, early weight bearing, and possible relief of inner-knee pain while preserving future options. The main risks include injury to the common peroneal nerve, which can cause numbness or foot weakness, as well as infection, bleeding, blood clots, and the possibility that pain does not improve enough.

Is the proximal fibular osteotomy procedure painful?

Some pain and swelling at the incision site are normal for the first days and are usually controlled with oral medicines, elevation, and ice. Discomfort typically eases over the following weeks. New or worsening pain, especially with fever or redness, should be reported to your care team.

Is proximal fibular osteotomy a permanent solution for knee arthritis?

No. It does not repair cartilage or stop osteoarthritis from progressing. Its purpose is to reduce symptoms and, in some cases, delay knee replacement. Some people will still need further surgery later. Long-term evidence for the procedure is still being gathered.

How does it compare with high tibial osteotomy?

Both procedures aim to unload the inner compartment of the knee. High tibial osteotomy realigns the shin bone directly and usually requires a plate and screws, a longer recovery, and a period of restricted weight bearing, but it has a longer track record. Proximal fibular osteotomy is simpler and quicker to recover from, but its long-term results are less well established. Your surgeon can explain which is more suitable for your alignment and knee condition.

When to see a doctor

You may wish to be assessed by an orthopedic specialist if you have knee pain on the inner side of the joint that persists for several months, limits walking or daily activities, or is not controlled by rest, exercise programs, weight management, or over-the-counter pain medicines. A gradual bow-legged change in the shape of your leg, stiffness after sitting, or swelling that keeps returning are also reasons to seek a full evaluation. A specialist can confirm whether the problem is osteoarthritis and discuss the full range of options, including non-surgical care, proximal fibular osteotomy, other osteotomies, and joint replacement.

After the operation, contact your surgical team or seek urgent care if you notice any of the following:

• New or increasing numbness, tingling, or weakness in the foot or toes, or difficulty lifting the foot.
• Fever, chills, or increasing redness, warmth, swelling, or discharge at the incision.
• Pain, swelling, or tenderness in the calf that is getting worse, which could indicate a blood clot.
• Sudden shortness of breath or chest pain, which requires emergency care immediately.
• Bleeding that soaks through the dressing or a wound that opens.
• Severe pain that is not relieved by prescribed medicines.

Regular follow-up visits are part of safe recovery, and attending them allows your team to check healing, alignment, and nerve function over time.