Why this technique matters: correcting femoral valgus with precision
Distal femoral osteotomy (DFO) is a key joint-preserving surgery used to treat valgus knee deformity and lateral compartment overload. This study describes a biplanar medial closing-wedge osteotomy using a dedicated plate fixator (e.g., TomoFix MDF) to improve alignment while maintaining stability and promoting reliable healing.
Biplanar DFO: surgical indications and procedural strategy
The procedure is indicated for metaphyseal frontal-plane deformities of the femur, particularly when valgus alignment produces lateral compartment osteoarthritis or overload. Contraindications include advanced osteoarthritis of the opposite compartment, poor soft-tissue conditions, limited range of motion, and active infection.
The biplanar technique involves an incomplete posterior osteotomy combined with a complete anterior cut, wedge removal, and controlled closure of the medial gap. This approach helps control rotational forces and protects the lateral cortex hinge, reducing the risk of uncontrolled fracture.
After correction, alignment is checked radiographically before fixation with a specific plate fixator for the medial femur (TomoFix MDF), allowing secure submuscular fixation.
Post-operative management and healing outcomes
Early mobilisation is encouraged: an elastic dressing and partial weight-bearing (≈15 kg) are advised for the first 4 weeks. Follow-up X-rays on day 3 and 4 weeks post-surgery help confirm progress. Union typically occurs by 4-6 weeks in most patients.
Complications included delayed or nonunion in some early cases, superficial and deep infections, haematoma, and plate-related fractures; however, most osteotomies healed without issue.
Functional measures improved, with Tegner activity score rising from ~2.8 pre-op to ~5.6 post-op, and VAS pain scores decreasing from ~6.8 to ~3.1.
Why biplanar closing wedge matters in DFO biomechanics
A biplanar osteotomy offers biomechanical advantages over a uniplanar cut by increasing bone-to-bone contact area and providing inherent rotational control, which may reduce the risk of hinge fractures and malunion. It also protects the lateral cortex and allows more predictable alignment correction.
Clinical pointers for surgeons
- Ensure precise pre-operative deformity analysis (mechanical axis, joint line obliquity, femoral mechanical lateral distal femoral angle).
- The biplanar technique facilitates accurate correction while minimising rotational instability.
- Use of a dedicated plate fixator enhances primary stability, supports early mobilisation, and may reduce prolonged non-weight-bearing.
- Monitor for potential complications (delayed union, infection, plate fracture), particularly in the learning curve phase.
Take-home message
A medial closed wedge DFO using biplanar technique with a specific plate fixator is an effective strategy for correcting femoral valgus deformities. With meticulous planning, stable fixation, and careful post-op management, it can achieve significant alignment correction, pain reduction, and functional improvement.
Link to full paper: Medial Closed Wedge Osteotomy of the Distal Femur in Biplanar Technique and a Specific Plate Fixator
Sources used in report overview:
- https://www.researchgate.net/publication/316896570_Medial_closed_wedge_osteotomy_of_the_distal_femur_in_biplanar_technique_and_a_specific_plate_fixator
- https://pubmed.ncbi.nlm.nih.gov/28497247/
- https://www.sciencedirect.com/science/article/pii/S2212628721000724
- https://www.arthroscopytechniques.org/article/S2212-6287%2821%2900103-1/fulltext
Published: May, 2017
Featuring: Dr Kristian Kley
