Distal femoral osteotomy is a joint-preserving knee surgery used to correct alignment problems when the deformity comes mainly from the lower part of the femur, just above the knee. In my practice, I usually explain to patients that this operation is not simply about “cutting the bone.” Its main purpose is to shift abnormal pressure away from a damaged side of the knee so that pain improves, function becomes better, and the need for knee replacement may be delayed in properly selected patients [1].
For many Bangladeshi patients and families, the term sounds unfamiliar, but the underlying problem is common enough: knee pain due to malalignment, especially when the leg is more knock-kneed, also called valgus alignment. When that valgus alignment overloads the outer, or lateral, side of the knee, patients may develop pain, cartilage wear, meniscus problems, and difficulty with walking, stairs, prayer movements, squatting, or work-related activity [1][2].
I want to be clear that distal femoral osteotomy is not suitable for every patient with knee pain. It is usually considered for selected younger or middle-aged active patients with one-sided knee overload and a correctable deformity, especially when we are trying to preserve the natural knee joint rather than move directly to joint replacement [1][3].
What Is Distal Femoral Osteotomy?
An osteotomy means a controlled surgical cut in the bone. In distal femoral osteotomy, the cut is made in the lower femur, the thigh bone above the knee, to correct the overall alignment of the leg. The bone is then repositioned and fixed with metal hardware such as a plate and screws while it heals [1].
Why is this operation done?
The goal is to redistribute load across the knee joint. If too much force is repeatedly passing through one compartment of the knee, that side can wear out faster. By correcting alignment, we can reduce pressure on the overloaded area and improve mechanical balance [1][2].
In my practice, I often see this discussion come up in patients who have:
- valgus, or knock-knee, alignment
- pain mainly on the outer side of the knee
- lateral compartment cartilage wear or osteoarthritis
- persistent symptoms after meniscus or cartilage injury
- instability patterns where malalignment is part of the problem
Most valgus knees that need correction have the deformity at the femoral side, which is why distal femoral osteotomy is an important option in this group [2].
Who May Benefit from Distal Femoral Osteotomy?
This surgery is usually not the first treatment for general knee pain. It is more of a targeted solution for a targeted mechanical problem.
Typical candidates
Patients who may be considered include those who have:
- pain mainly on one side of the knee
- a visible or measurable valgus deformity
- relatively preserved knee motion
- an active lifestyle
- a desire to preserve the native knee joint if possible
- disease mainly in one compartment rather than the whole knee
AAOS notes that osteotomy is often most effective in active patients under 60 with pain affecting one side of the knee and adequate knee motion before surgery [1]. That general principle also guides distal femoral osteotomy selection.
Patients who may not be ideal candidates
I usually become more cautious when a patient has:
- advanced arthritis affecting multiple compartments
- major inflammatory arthritis such as rheumatoid arthritis
- severe stiffness
- poor bone quality
- uncontrolled medical illness
- unrealistic expectations about recovery
One important point I want Bangladeshi patients to understand is that successful osteotomy depends not only on the surgery itself, but also on patient selection, rehabilitation, follow-up, and bone healing. Someone who cannot realistically follow a protected weight-bearing plan may struggle during recovery.
Why Alignment Matters in Knee Pain
The knee does not fail only because of age. It also fails because of repeated abnormal load. If the leg alignment is off, the joint surface on one side bears more weight than it should. Over time, that extra pressure may damage cartilage and worsen pain [1].
Valgus knee and lateral compartment overload
In a valgus knee, the mechanical axis shifts so that the lateral side of the knee carries more load. Distal femoral osteotomy is commonly used to address this pattern and has been studied particularly for valgus malalignment with lateral compartment disease [2][3][4].
When I evaluate patients with this problem, I do not only look at where the knee hurts. I also assess the whole limb alignment, because treating the pain without correcting the mechanical cause may not give durable relief.
How I Evaluate a Patient Before Recommending Distal Femoral Osteotomy
This decision should be individualized. A proper evaluation usually includes symptom history, physical examination, and imaging-based alignment analysis.
Clinical questions I focus on
- Where exactly is the pain?
- Is it mainly on the outer side of the knee?
- Is there instability, giving way, or prior ligament injury?
- Has the patient had previous meniscus or cartilage surgery?
- Does the patient have trouble with walking, stairs, work, or prayer activities?
- Is the problem getting worse despite non-surgical treatment?
Imaging and planning
Before surgery, I typically need standing X-rays and full-length alignment views. Preoperative planning is essential because the correction has to be precise. AAOS emphasizes careful X-ray-based planning before osteotomy, and that principle is especially important in distal femoral osteotomy [1].
In selected cases, MRI may also help assess cartilage, meniscus status, or associated ligament and soft tissue problems. Sometimes distal femoral osteotomy is considered alone, and sometimes it is combined with cartilage, meniscal, or patellar-stability procedures depending on the mechanical problem.
Types of Distal Femoral Osteotomy
There are different technical methods, and the choice depends on anatomy, correction goals, surgeon preference, and the details of the deformity.
Closing wedge distal femoral osteotomy
In this technique, a wedge of bone is removed and the bone is closed to correct alignment.
Opening wedge distal femoral osteotomy
In this technique, the bone is opened to create the planned correction and then stabilized with fixation, sometimes with graft support depending on the case.
Systematic reviews have compared medial closing-wedge and lateral opening-wedge approaches for the valgus knee, and both approaches are used in practice [3][4]. I usually explain to patients that the technical choice is individualized and should be based on what best fits their deformity and surgical plan, not on trend-based thinking.
