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Normo-or slightly overcorrection show better results after medial closing wedge high tibial osteotomy

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The objectives of this study were to evaluate functional results, revision-free survival, and the influence of postoperative alignment on outcomes after MCWHTO.

Methods

This retrospective study included 27 MCWHTO operated on from 2009 to 2021. Radiographic measurements were performed pre- and postoperatively.

The HKA (Hip-Knee-Ankle angle), MPTA (Medial Proximal Tibial angle), LDFA (Lateral Distal Femoral Angle), JLO (Joint Line Obliquity), and JLCA (Joint Line Convergence Angle) were evaluated. The Knee injury and Osteoarthritis Outcome Score (KOOS), the International Knee Society (IKS) Function and Knee Score, and the Subjective Knee Value (SKV) as well as revision-free survival were evaluated. Postoperative alignment and its influence on clinical outcomes were also analysed.

Results

The mean follow-up was 61.9 months ± 31.4 (13–124). The HKA, MPTA, and JLCA angles were decreased post-operatively (respectively, Δ = 5.9° ± 2.6, p < 0.001; Δ = 6.1° ± 3.2, p < 0.001 and Δ = 2.5° ± 1.9, p < 0.001). LDFA and JLO were unchanged, post-operatively (respectively, Δ = 0.1° ± 2.2, p = 0.93 and Δ = 1.2° ± 3.3, p = 0.23). Postoperative HKA correlated with knee IKS (R = − 0.15, p = 0.04) and function IKS (R = − 0.44, p = 0.03). Postoperative LDFA correlated with knee IKS(R = 0.8, p < 0.01). Patients with postoperative HKA ≤ 180° had better KOOS (Δ = 12.3, p = 0.04) and IKS function (Δ = 28.1, p < 0.01) than those with HKA > 180°.

Conclusion

Functional results and revision-free survival after MCWHTO are satisfactory when the deformity is located in the proximal tibia. The joint line obliquity is not significantly altered with small tibial correction and, obtaining an overall neutral or slightly varus alignment under the conditions of this study allowed an improvement in the postoperative clinical scores. The literature is still inconclusive on the ideal alignment for valgus deformities and larger series are needed to draw definitive conclusions.

Level of evidence

IV, case series.

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Funding

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Authors and Affiliations

Authors

Contributions

AM and GM wrote the manuscript, LM and PS performed the inter-observer angle measurements, JE and J-FG and NB and RBdeD corrected the different versions. GM designed the protocol and performed statistical analysis. All authors approved the final manuscript.

Corresponding author

Correspondence to Grégoire Micicoi.

Ethics declarations

Conflict of interest

Dr. Ernat is a paid consultant for Johnson & Johnson Depuy Mitek Sports Medicine. He is a committee member for the Arthroscopy Association of North American and the American Orthopedic Society for Sports Medicine. He is an editorial board member for Arthroscopy Journal. Pr Gonzalez is a paid consultant for Amplitude. The other authors have no conflicts of interest.

Ethical approval

The advisory ethic committee (Ethics Committee of the Côte d'Azur University) approved this study under the number IRB 2023–032.

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Machado, A., Micicoi, L., Ernat, J. et al. Normo-or slightly overcorrection show better results after medial closing wedge high tibial osteotomy. Knee Surg Sports Traumatol Arthrosc 31, 4276–4284 (2023). https://doi.org/10.1007/s00167-023-07465-1

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