Comparison of Eight-plate with Reconstruction-plate in Temporary Hemiepiphysiodesis to Correct the Idiopathic Genu Valgum in Pediatrics

High cost of eight-plate makes it unavailable in many countries; therefore, developing an alternativedevice for temporary hemiepiphysiodesis of knee deformities in pediatrics is valuable. In this study, we compared theoutcome of the eight-plate with the reconstruction-plate in this setting. In this retrospective study, 109 skeletally immature patients (212 physes) who underwent temporaryhemiepiphysiodesis to correct idiopathic genu valgum were included. The eight-plate and reconstruction-plate wereused in 45 patients (90 physes) and 62 patients (122 physes), respectively. Outcome measures were the valgus angle,medial proximal tibial angle (MPTA), the lateral distal femoral angle (LDFA), the joint-line convergence angle (JLCA),and lower limb mechanical axis (LLMA). The baseline characteristics of the patients were comparable between the two plate groups. The meanfollow-up of the patients was 32.9 ± 15.1 months. The mean MPTA change was 2.7 ± 3.7º in the eight-plate groupand 2.1 ± 3.4º in the reconstruction-plate group (P=0.2). The mean LDFA improvement was 8 ± 3.7º in the eight-plategroup and 7.9 ± 3.5º in the reconstruction-plate group (P=0.61). The mean valgus correction was 10.7 ± 4.4º in theeight-plate group and 10.4 ± 4.6º in the reconstruction-plate group (P=0.74). Moreover, the mean change of JLCA was0.7 ± 1.3º in the eight-plate group and 0.8 ± 1.3º in the reconstruction-plate group (P=0.58). The postoperative LLMAwas comparable between the two study groups as well. In total, five postoperative complications were recorded inthis series, which included one case of screw loosening in each group, two cases of overcorrection, and one screwbreakage in the reconstruction-plate group. The radiologic results and complications of the reconstruction-plate are comparable with the eight-plate.Therefore, it can be safely and efficiently used in hemiepiphysiodesis to correct idiopathic genu valgum.Level of evidence: III