Straightening the Curve: Can a Simple Osteotomy Fix Genu Valgum?
"Discover how a lateral open-wedge distal femoral osteotomy can correct genu valgum, improve knee function, and potentially enhance patella stability without needing bone grafts."
Osteotomies around the knee serve as a well-established solution for addressing varus and valgus malalignment in the lower extremity. These procedures work by shifting the mechanical axis, transferring weight from a damaged compartment to a healthier one. In cases where symptoms are absent, knee osteotomies can also restore a more natural mechanical axis, which helps to prevent further joint damage.
The type of corrective osteotomy performed—whether on the proximal tibia or distal femur—depends on the origin of the deformity, as determined by a malalignment test. For valgus malalignment cases with a reduced mechanical lateral distal femoral angle (mLDFA), a distal femur osteotomy using an opening wedge technique is often employed.
While the open-wedge technique is commonly used for tibial correction of varus deformities, its application in femoral corrections has been a subject of debate. However, a new study analyzes the outcomes of patients treated with lateral opening wedge distal femoral osteotomy (LOWDFO), focusing on bone healing without grafting and considering the impact of patient age. This article unpacks the key findings of this research for you.
LOWDFO: A Reliable Solution Without Bone Grafting?
The study retrospectively analyzed twenty-two consecutive patients with genu valgum. These patients underwent twenty-three LOWDFOs using a Tomofix-locking plate. The average patient age was 23.7 years. Researchers evaluated clinical outcomes using pre- and post-operative Knee injury and Osteoarthritis Outcome Scores (KOOS) and radiographic assessments, including mechanical axis deviation (MAD), mechanical lateral distal femoral angle (mLDFA), leg length discrepancy (LLD), bone healing, and patella parameters.
- Improved Knee Function: Significant improvements were observed in KOOS scores, indicating better overall knee function.
- Reliable Bone Healing: Bone grafting wasn't necessary for reliable bone healing, simplifying the procedure.
- Leg Length Correction: The surgery led to a measurable increase in leg length, which can be beneficial for patients with discrepancies.
- Patella Stability: Changes in the Blackburne-Peel ratio suggest potential for increased patella stability.
Outcomes and Trade-offs in Distal Femoral Osteotomy
An updated review reports that three authors used the Knee injury and Osteoarthritis Outcome Score (KOOS), with mean scores improving by 16.7 points, from 60 to 76.5. A biomechanical study focused on hinge fractures after varisation distal femoral osteotomies and identifies malunion of the osteotomy gap and hinge fractures as major concerns for both techniques. A separate report says closing-wedge osteotomy provides correction without an osteotomy gap, compared with opening-wedge techniques. A 2025 retrospective study evaluated medial closing-wedge osteotomy with a paediatric locking plate in 25 adolescents (36 knees), whose mean age was 12.74 years.
Limits in the Evidence
A study of lateral open-wedge distal femoral varus osteotomy without bone grafting identifies its retrospective design as a limitation. It also reports a limited cohort size, particularly in the subgroup treated with bone grafting and among older patients. These limitations constrain how broadly the study’s findings can be applied.
LOWDFO: A Promising Solution for Genu Valgum
The study's findings support the use of lateral opening wedge distal femoral osteotomy (LOWDFO) without bone grafting as a safe and effective method for correcting genu valgum, especially in younger patients. The procedure not only improves knee alignment and function but also offers potential benefits in terms of leg length correction and patella stability.
No Single Osteotomy Has Emerged as Best
The available sources describe several approaches to genu valgum correction, including supracondylar femoral osteotomy and high tibial osteotomy, selected according to the deformity’s location and severity. One report notes satisfactory outcomes after supracondylar osteotomies, while another says that none of the reported open- and closed-wedge distal femoral techniques has proved best. A report on V osteotomy describes it as a rarely reported, wedgeless procedure and notes only a few case series, including 167 cases of isolated distal femur V osteotomy in young patients under 25 in the literature it reviewed.
The Search for an Accepted Technique
A review of corrective osteotomies for genu valgum arising from the distal femur lists lateral opening-wedge, medial closing-wedge, dome, wedgeless spike, and V osteotomies. It describes few advantages of one technique over another and reports that there remains a dilemma about which osteotomy is most accepted. The source therefore points to an unresolved choice among established approaches rather than a settled preferred procedure.
Correction and Fixation Matter
A source on distal femur translation for genu valgum reports that distal femoral osteotomy can effectively treat disabling deformity when correction is complete and osteosynthesis is effective. It also describes medial distal femoral osteotomy combined with interlocking nailing as an effective approach for knee osteoarthritis with valgus deformity. These observations link the reported effectiveness to both the adequacy of correction and the fixation method.
Care Depends on the Person and the Case
A case study on severe genu valgum reports that rapid physical therapy helped achieve functional goals; it also identifies idiopathy as the most common cause and notes that genu valgum is widespread in underdeveloped and third-world countries. A case report of a 32-year-old active male with severe bilateral genu valgum describes reliable healing without bone grafting after step-cut rotational distal femoral osteotomy and says the procedure prolonged the need for knee arthroplasty. Another source recommends assessing the cause through careful history, physical examination, and appropriate imaging, and lists options for persistent genu valgum ranging from lifestyle modification, NSAIDs, bracing, and physiotherapy.
While the study acknowledges limitations such as its retrospective design and limited sample size, the results provide valuable insights for orthopedic surgeons and patients considering treatment options for genu valgum.
Further research with larger cohorts and prospective designs is encouraged to validate these findings and explore the long-term outcomes of LOWDFO without bone grafting.