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  • Title: Change in leg length after open-wedge high tibial osteotomy can be predicted from the opening width: A three-dimensional analysis.
    Author: Yamamuro Y, Kabata T, Goshima K, Kajino Y, Inoue D, Ohmori T, Ueno T, Takagi T, Yoshitani J, Ueoka K, Taninaka A, Tsuchiya H.
    Journal: Knee; 2021 Jun; 30():185-194. PubMed ID: 33940306.
    Abstract:
    BACKGROUND: The purpose of this study was to evaluate true change in leg length after open-wedge high tibial osteotomy (OWHTO) using three-dimensional (3D) assessments, examine the factors that influence leg lengthening and verify their validity in clinical practice. METHODS: Study 1: a retrospective case series simulation study, included 46 patients (55 knees) that underwent knee arthroplasty or HTO. OWHTO was simulated from preoperative computed tomography using 3D preoperative planning software. Uni- and multivariate regression analyses were conducted to identify predictors related to change in leg length. Study 2: a retrospective case series study, included 53 patients (55 knees) that underwent OWHTO in another institution. Change in leg length was measured preoperatively and 1 year postoperatively and was compared with the predicted change in leg length calculated using the formula obtained from Study 1. RESULTS: Study 1: the true change in leg length significantly increased and showed a strong correlation with the opening width. The change in leg length was predicted using the formula "change in leg length = opening width × 0.75-1.5." Study 2: the predicted change in leg length showed no significant difference from the change in leg length 1 year postoperatively and a strong correlation with the measured change. CONCLUSIONS: The true change in leg length after OWHTO was predicted using the formula obtained from the 3D model. Predicting the change in leg length preoperatively can be a basis to consider other HTOs.
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