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Transverse osteotomy closer to tibial plateau is associated with larger postoperative change in valgus laxity after open-wedge high tibial osteotomy

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To identify the factors impacting changes in valgus laxity between before and after open-wedge high tibial osteotomy (OW-HTO) using quantitative valgus stress radiographs.

Methods

A total of 40 knees from 38 patients who underwent OW-HTO were assessed. The study population comprised 14 men and 24 women, with a mean age of 61.5 years. Valgus stress radiographs before and 1 year after OW-HTO were performed using a Telos device. The difference between pre- and postoperative joint line convergence angle (JLCA) was expressed as ΔJLCA (post–pre). As indicators of the proximal detachment of superficial medial collateral ligament (sMCL) on radiographs, two distances were defined: the distance from the level of the osteotomy starting point to the tangent line of the proximal tibial plateau (Distance A), or to the medial edge of the proximal tibial plateau (Distance B). Correlations between ΔJLCA and radiographic parameters or KOOS sub-scores were assessed using Spearman’s rank correlation coefficient analysis. Receiver operator curves were generated to evaluate the predictive strength of the significant factor for an increase in ΔJLCA > 1°.

Results

Pre-operative OA severity consisted of Kellgren–Lawrence grade 2 (n = 18), 3 (n = 16), and 4 (n = 6). The average ΔJLCA (post–pre) was 0.5°, and ranged from − 1.4° to + 3.0°. The maximum systemic measurement error and limits of agreement were 0.07° and 0.20°, respectively. There were significant correlations between ΔJLCA and Distance A (36.9 ± 3.9 mm, R =  − 0.46, p = 0.002), between ΔJLCA and Distance B (39.9 ± 4.0 mm, R =  − 0.49, p = 0.001). The cut-off value for Distance A was determined to be 35 mm below the tibial plateau; the AUC was 0.804, with a sensitivity of 0.75 and a specificity of 0.82. Distance B correlated strongly with Distance A (R = 0.96, p < 0.001). There was no significant correlation between ΔJLCA and KOOS sub-scores 1 year after OW-HTO.

Conclusions

Transverse osteotomy closer to tibial plateau was associated with larger valgus joint laxity postoperatively. This finding implies that sMCL proximal detachment, which was related to the level of the osteotomy starting point on the proximal tibia, potentially affected postoperative valgus laxity.

Level of evidence

IV.

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Abbreviations

OW-HTO:

Open-wedge high tibial osteotomy

OA:

Osteoarthritis

sMCL:

Superficial medial collateral ligament

TKA:

Total knee arthroplasty

JLCA:

Joint line convergence angle

HKAA:

Hip–knee–ankle angle

%MA:

Percentage of mechanical axis

MPTA:

Medial proximal tibial angle

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Correspondence to Yukio Akasaki.

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Ethical approval was provided in the Methods just before statistical analysis.

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Soejima, Y., Akasaki, Y., Hamai, S. et al. Transverse osteotomy closer to tibial plateau is associated with larger postoperative change in valgus laxity after open-wedge high tibial osteotomy. Knee Surg Sports Traumatol Arthrosc 30, 3983–3991 (2022). https://doi.org/10.1007/s00167-021-06810-6

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