Large tibial varus deformities can be challenging to correct with standard extra-articular high tibial osteotomies (HTO). These conventional approaches may fail to fully restore the joint line or address intra-articular deformity. This technical note presents the Chiba Osteotomy — a tibial condylar valgus osteotomy (TCVO) technique designed to correct significant tibial varus while preserving knee joint congruence and restoring physiological joint alignment.
When to consider a Chiba (TCVO) osteotomy
This technique is most suitable when:
- The varus deformity is large or severe, beyond what standard HTO can correct effectively
- Joint line obliquity or intra-articular deformity is present
- Metaphyseal apex deformity, plateau collapse or post-traumatic deformity is involved
- Joint congruence needs to be restored, not just mechanical axis realignment
Compared to conventional HTO, the Chiba/TCVO approach directly addresses deformity at the condylar level, allowing more anatomic restoration.
How the technique works: key surgical steps
- Pre-operative analysis: Full-length alignment radiographs with assessment of joint line, tibial plateau morphology and varus magnitude
- Osteotomy design: An L-shaped intra-articular cut beginning medially and extending towards the intercondylar area, enabling controlled valgus correction at the tibial condyle
- Correction goals: Restore joint congruence and mechanical axis simultaneously, improving both load distribution and knee kinematics
- Fixation: Stable fixation, with post-operative rehab guided by consolidation, is essential for restoration of function
This approach differs from standard wedge osteotomies by operating closer to the joint line, directly correcting joint-line geometry.
Clinical benefits and rationale
- Allows greater correction of large varus deformities
- Rebalances the knee by improving joint congruence, not only the mechanical axis
- Addresses deformity at its anatomical source (condyle), providing a more anatomical realignment
- Particularly useful in young or active patients where joint preservation is prioritised
Take-home messages for surgeons
- Consider a TCVO/Chiba osteotomy when varus deformity is severe and associated with joint-line or intra-articular deformity
- It provides a joint-preserving and joint-rebalancing solution beyond conventional HTO
- Pre-operative planning should assess both alignment and joint geometry to determine suitability
- Technique precision is critical — especially regarding hinge placement and intra-articular correction
Link to full paper: Chiba Osteotomy (Tibial Condylar Valgus Osteotomy) for a Large Tibial Varus Deformity: Technical Note
Sources used in report overview:
- https://www.researchgate.net/publication/383430342_Chiba_Osteotomy_Tibial_condylar_valgus_osteotomy_for_a_Large_Tibial_Varus_Deformity_Technical_note?_tp=eyJjb250ZXh0Ijp7InBhZ2UiOiJzY2llbnRpZmljQ29udHJpYnV0aW9ucyIsInByZXZpb3VzUGFnZSI6bnVsbH19
- https://aoj.amegroups.org/article/view/7570/html
- https://cdn.amegroups.cn/journals/aoj/files/journals/28/articles/7570/public/7570-PB8-1802-R3.pdf
