Distal Femoral Osteotomy in Sydney

What is a distal femoral osteotomy?

A distal femoral osteotomy, often shortened to DFO, is a knee realignment operation performed at the lower end of the thigh bone, just above the knee. It is most often used when valgus alignment, commonly called knock-knees, places too much load through the outer, or lateral, side of the knee.

The aim is not to replace the knee joint. Instead, the bone is carefully cut, realigned and fixed in a new position so that weight passes through the knee in a more balanced way. This can reduce pressure on the overloaded lateral compartment and help protect the joint when the rest of the knee is still suitable to preserve.

A distal femoral osteotomy is a more selective procedure than a knee replacement. It is a type of knee osteotomy usually considered for younger or more active patients, or for people whose knee wear is mainly on one side of the joint. A high tibial osteotomy may be considered when realignment is needed through the tibia instead. It may also be used alongside cartilage restoration, meniscal transplant or ligament surgery when alignment is contributing to the problem.

Do you need a distal femoral osteotomy?

A distal femoral osteotomy is usually considered when valgus alignment is contributing to overload on the outside of the knee. This may cause lateral knee pain, swelling after activity, reduced walking tolerance, difficulty on uneven ground or symptoms that keep returning despite good rehabilitation.

You may be suitable if your symptoms match your imaging, the lateral compartment is overloaded, and the rest of the knee has enough healthy cartilage to preserve. Assessment usually includes a detailed history, knee examination, standing long-leg X-rays and often MRI to understand the cartilage, meniscus and ligament picture.

A distal femoral osteotomy may not be suitable if knee osteoarthritis is widespread across the knee, the joint is very stiff, inflammatory arthritis is present, the knee is severely unstable, bone quality is poor, or a knee replacement would provide a more reliable result. The goal of your consultation is to match the treatment to the actual problem, not simply to the appearance of the leg.

Benefits and risks

What you can expect it to achieve

• Reduce load through the overloaded lateral compartment of the knee
• Improve pain related to valgus alignment and outer-knee overload
• Help preserve the natural knee joint in suitable patients
• Potentially delay the need for total knee replacement
• Support other joint-preserving procedures, such as cartilage or meniscus surgery, when alignment is part of the problem
• Improve lower-limb mechanics for walking, stairs and uneven ground
• Allow a personalised rehabilitation plan focused on strength, control and confidence

Risks to understand

• Common and temporary: swelling, bruising, stiffness, discomfort around the plate and reduced strength in the early recovery period
• Bone healing risks: delayed union, non-union, loss of correction or fracture through the bone hinge
• Surgical risks: infection, wound problems, blood clots, nerve or blood vessel injury, and anaesthetic complications
• Hardware-related risks: plate or screw irritation, screw problems or the need for later removal if hardware becomes symptomatic
• Longer-term risks: ongoing pain, progression of arthritis, incomplete symptom relief or later conversion to knee replacement

All surgery carries risk and outcomes vary between individuals. A distal femoral osteotomy can be very useful when alignment is the main driver of lateral knee overload, but it is not the right operation for every painful knee.

Distal femoral osteotomy	Knee replacement
Realigns the thigh bone to redistribute load	Replaces worn joint surfaces with implants
Preserves the natural knee joint	Used when joint surfaces are too damaged to preserve
Usually considered for selected active patients	Often used for advanced arthritis affecting daily life
Requires bone healing before full progression	Usually allows earlier weight-bearing, depending on the case
May delay the need for replacement	Designed to treat established end-stage arthritis

The procedure: what happens

Before surgery, your surgeon will plan the correction using standing long-leg X-rays. These images show the hip, knee and ankle together, allowing the mechanical axis of the leg to be measured. MRI may also be used to assess cartilage, meniscus and ligament health.

The operation is performed under general or spinal anaesthesia. During surgery, the distal femur is exposed through an incision around the lower thigh and knee. The bone is carefully cut in a controlled way and then opened or closed depending on the correction required.

There are two main techniques: a lateral opening wedge osteotomy and a medial closing wedge osteotomy. In an opening wedge procedure, a controlled gap is created and may be supported with bone graft or bone substitute. In a closing wedge procedure, a wedge of bone is removed and the bone ends are brought together. The best technique depends on your anatomy, correction size, bone quality and your surgeon’s plan.

Once the alignment has been corrected, the bone is fixed with a plate and screws. X-ray imaging is used during the operation to check the correction and hardware position. The wound is then closed and covered with dressings.

After surgery

You will wake in the recovery room, where your pain, circulation and vital signs are monitored closely. Once stable, you will return to the ward and begin early recovery with nursing and physiotherapy support.

Unlike many knee replacement procedures, full weight-bearing is not always immediate after a distal femoral osteotomy. Because the bone needs to heal, weight-bearing is usually progressed gradually and guided by your surgeon, X-rays and rehabilitation team.

Distal femoral osteotomy recovery and rehabilitation

Recovery after distal femoral osteotomy is built around two priorities: allowing the bone to heal and restoring strength, movement and confidence. Because the procedure creates a controlled bone cut, your recovery is usually more protected than after many soft-tissue knee operations.

You will usually use crutches after surgery. Weight-bearing is often limited at first, then increased gradually over several weeks once follow-up X-rays show appropriate healing. The exact plan depends on the technique used, the amount of correction, bone quality, fixation strength and your surgeon’s instructions.

Recovery timeline

Phase	Timeframe	What to expect
Protect & settle	Days 0–14	Crutches, swelling control, wound care, gentle movement, pain management and early muscle activation
Protected loading	Weeks 2–6	Gradual rehabilitation while protecting the osteotomy site; weight-bearing depends on your surgeon’s protocol
Healing check	Weeks 6–12	X-rays guide progression; walking, range of motion, strength and balance work are gradually increased
Strength & control	Months 3–6	Progressive strengthening, gait retraining, cycling, balance and return to more normal daily activity
Return to activity	Months 6–12	Ongoing strength, confidence and conditioning; return to higher-level activity is individual and surgeon-guided

Timeframes are a guide. Your surgeon and rehabilitation team will progress you based on bone healing, symptoms, strength and your goals.

Post-operative care

At home, the priorities are protecting the osteotomy, keeping the wound clean and dry, controlling swelling, using crutches safely, taking medication as prescribed and completing your rehabilitation exercises. Follow-up X-rays are used to monitor bone healing before your loading and activity levels are increased.

Rehabilitation at MTP Health

This is where MTP Health is different. Your rehabilitation is delivered by our own physiotherapists and exercise physiologists, working in the same clinic as your surgeon. Your plan can begin before surgery and continue afterwards, with everyone working from the same goals and shared clinical record.

Rehabilitation focuses on restoring knee movement, rebuilding quadriceps and hip strength, improving balance, retraining walking mechanics and preparing you for the activities that matter to you. Your recovery may be supported by our pre-operative rehabilitation, post-operative rehabilitation, physiotherapy and exercise physiology services.

Returning to driving, work and sport

Return to driving depends on which leg was operated on, whether you drive an automatic or manual car, your weight-bearing status, reaction time, pain control and medication use. You must be able to safely perform an emergency stop and must no longer be taking strong pain medication. Please check with your surgeon and insurer before driving.

Desk-based work may be possible once pain is controlled, mobility is safe and you can manage transport and swelling. More physical work usually takes longer, especially if it involves standing, lifting, stairs, kneeling or uneven ground. Return to sport is gradual and depends on bone healing, strength, joint health and the type of activity.

Distal femoral osteotomy cost in Sydney

The cost of distal femoral osteotomy depends on your private health cover, hospital insurance, surgeon fees, anaesthetist fees, assistant fees, hospital charges, implants, imaging and any excess on your policy.

If you are having surgery using private health cover, your out-of-pocket costs will depend on your level of cover, your fund’s arrangements, the hospital used and whether any reduced-gap arrangements apply. The anaesthetist is an independent practitioner and may charge a separate gap, so we provide their details and recommend checking their quote before surgery.

Because DFO surgery can involve specialised planning, implants and a longer rehabilitation pathway than some knee procedures, your team will talk you through expected costs before surgery wherever possible.

If surgery is performed through the public system, there may be no out-of-pocket surgical cost, but waiting times can be long and depend on hospital access, urgency category and local availability.

Why have your distal femoral osteotomy at MTP Health

MTP Health brings together fellowship-trained orthopaedic surgeons, careful surgical planning, physiotherapy and exercise physiology in one clinic. That matters because a distal femoral osteotomy is not just about changing an X-ray angle — it is about selecting the right patient, planning the correction accurately and guiding recovery properly.

Honest advice comes first. If your knee is better suited to non-surgical care, we will tell you. If arthritis is too advanced for realignment, we will explain why a replacement option may be more reliable. If a distal femoral osteotomy is suitable, we will help you understand the procedure, recovery, risks and expected outcome clearly before you decide.

Your surgeon

Frequently asked questions