Knee Osteotomy

How Alignment Influences Knee Wear

The knee relies on balanced forces to move smoothly. When the leg angles inward (varus) or outward (valgus), one compartment absorbs more impact than the other. Over time, this can increase localised stress on cartilage and the meniscus, especially during walking, running, or climbing stairs.

Factors that contribute to alignment-related joint load include:

• Natural variations in bone shape
• Previous fractures or growth plate injuries
• Long-standing ligament injuries that alter knee mechanics
• Early cartilage thinning in a single compartment
• Muscle weakness that affects gait patterns

Correcting alignment through osteotomy does not regenerate cartilage, but it may help shift the load toward a healthier area of the joint, allowing the affected side to experience less mechanical pressure during daily activities.

When Osteotomy May Be Considered Instead of Knee Replacement

Knee osteotomy is often considered for people who:

• Have pain on one side of the knee
• Have early to moderate arthritis confined to a single compartment
• Are younger or active and wish to maintain their own joint for as long as appropriate
• Have alignment that places excess load on a worn area
• Have good knee motion and stable ligaments

In some cases, osteotomy may help delay the need for a total knee replacement or partial knee replacement. However, it is typically not recommended when knee arthritis affects multiple compartments or when the knee is significantly stiff or unstable.

Suitability is always assessed on a case-by-case basis.

Symptoms That May Indicate Alignment-Driven Knee Pain

People with alignment-related mechanics often describe:

• Pain when standing for long periods
• Aching during or after walking
• Discomfort on uneven ground
• Swelling that returns with higher loads
• A sense of fatigue when bearing weight
• Difficulty with impact sports or hill walking

These symptoms may fluctuate depending on activity level, strength, and footwear. A comprehensive assessment ensures the symptoms are not due to meniscal tears, ligament injuries, or patellofemoral issues alone.

Imaging and Preoperative Planning

Accurate planning is essential for knee osteotomy because even small degrees of correction can influence how load is shared across the joint.

Your surgeon, such as Dr Jonathan Negus, may use:

• Standing long-leg X-rays to calculate alignment angles
• X-rays of the knee to evaluate joint space and bone quality
• MRI if cartilage, meniscus, or ligament concerns require review
• Clinical gait assessment to understand how you distribute weight during movement

These measurements guide the precise correction target to ensure that alignment is shifted sufficiently, without overcorrecting.

Non-Surgical Management Before Considering Surgery

Before discussing knee alignment surgery, most people try several conservative strategies. These cannot change alignment but may help manage symptoms.

These may include:

• Strengthening quadriceps, hamstrings, and hip muscles
• Gait retraining and load management
• Taping or bracing if it provides comfort
• Low-impact exercise, such as hydrotherapy or stationary cycling
• Weight management if relevant to joint load
• Anti-inflammatory strategies when suitable

If these approaches improve symptoms, surgery may not be necessary. If symptoms continue to limit your daily function, osteotomy may be explored.

Types of Knee Osteotomy

The type of osteotomy depends on which compartment of the knee is overloaded.

High Tibial Osteotomy (HTO)

Performed for varus alignment and medial compartment wear. A wedge-shaped adjustment near the top of the tibia shifts weight toward the healthier lateral side.

Distal Femoral Osteotomy (DFO)

Used for valgus alignment and lateral compartment wear. The correction is made in the lower femur to redistribute load toward the medial compartment.

Opening-Wedge and Closing-Wedge

The method chosen depends on bone shape, correction goals, and surgeon preference. Both methods aim to provide stable, predictable correction.

Combined Procedures

In selected cases, osteotomy may be performed alongside:

• Meniscal repair
• Cartilage repair techniques
• Ligament reconstruction

This is only considered when imaging and examination support a combined approach.

The Surgical Procedure

Knee osteotomy is usually performed under general or spinal anaesthesia. Guided by intra-operative imaging, the surgeon adjusts bone alignment and secures the corrected position with a plate and screws designed for stability. If done through an opening-wedge technique, the gap may be filled with bone graft or a synthetic substitute to support early healing.

Knee arthroscopy may also be performed at the same time to inspect cartilage and meniscal structures.

Recovery and Rehabilitation

Recovery is staged and depends on the size of the correction and bone healing. Common phases include:

• Protected weight-bearing with crutches for several weeks
• Gradual range-of-motion exercises
• Strengthening targeted muscle groups under physiotherapy supervision
• Gait retraining once partial or full weight-bearing is allowed
• Progressive return to cycling, swimming, or controlled gym work
• A gradual return to impact activities once healing is sufficient

Bone healing typically takes several months. Your surgeon and physiotherapist will outline timelines specific to your procedure.

Potential Risks and Considerations

All surgeries carry risks. Your surgeon will discuss these with you so that you can make a well-informed decision.

These may include:

• Delayed bone healing
• Irritation from the fixation plate
• Infection
• Blood clots
• Over- or under-correction
• Persistent or recurrent symptoms, depending on joint health

Some people may later undergo plate removal if it causes discomfort once bone healing is complete.

Long-Term Outlook

Knee osteotomy may help reduce compartment overload and support more comfortable movement when carefully selected. Ongoing physiotherapy, strength maintenance, and load awareness may help protect the joint over time.

While osteotomy may delay the need for knee replacement, it does not prevent arthritis progression in all cases. Outcomes vary depending on individual factors such as alignment, bone quality, and cartilage condition.

Next Steps

If you have ongoing symptoms linked to alignment or a single-compartment knee problem, a specialist assessment can help clarify whether osteotomy is a suitable option.

You can arrange a consultation with Dr Jonathan Negus, an orthopaedic knee surgeon in Sydney, to discuss your knee alignment and review personalised treatment pathways.

This information is intended as a general guide only and does not replace personalised medical advice. Assessment and treatment vary depending on individual circumstances. Please consult a qualified health professional for advice specific to your situation.