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Lateral intra-articular varus osteotomy is an L-shaped osteotomy of the lateral tibial condyle to correct mild knee valgus and lateral plateau malunion of the proximal tibia. In order to minimize injury, it was modified to preserve the posterolateral cortex and the upper tibiofibular joint. The aim of this study was to evaluate the stability of modified lateral intra-articular varus osteotomy by comparing the biomechanical strength with lateral intra-articular varus osteotomy. Twenty-four synthetic tibia models were divided into 2 groups based on osteotomy type. Each model was then fixed with 2 commonly used plate systems. Biomechanical tests were conducted to measure parameters including construct stiffness, wedge displacement, and the number of failed specimens, and the results were compared among different groups. No significant difference was found in construct stiffness among all groups (P > 0.05). There was also no significant difference in wedge displacement among all groups (P > 0.05). When an axial load of 1500 N was applied, the number of failed specimens showed no significant difference among all groups (P > 0.05). The main failure pattern was additional fracture lines on the lateral tibial plateau. The findings indicate that there was no significant difference in stability between the 2 groups under the tested loading conditions. Furthermore, it appears that preserving the posterolateral cortex may have no impact on biomechanical stability. • Biomechanical study of lateral high tibia osteotomy with synthetic bones. • Modified lateral intra-articular varus osteotomy construct is stable. • Modified osteotomy has comparable reliability compared to traditional osteotomy. [ABSTRACT FROM AUTHOR]