• Takuya Kinoshita, Yusuke Hashimoto, Yohei Nishida, Ken Iida, and Hiroaki Nakamura.
• Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan.
• Arch Orthop Trauma Surg. 2022 Apr 1; 142 (4): 649-655.

PurposeThe characteristic two-dimensional bone morphology in patients with a discoid lateral meniscus (DLM) has been described. However, the associated three-dimensional imaging findings have not been characterized. This study was performed to identify differences in the knee bone morphology between juvenile patients with a DLM and those with a normal meniscus using magnetic resonance (MR) imaging.MethodsThe DLM group comprised 33 consecutive juvenile patients (33 knees) with a complete DLM, and the control group comprised 24 juvenile patients (24 knees) with normal menisci on the basis of MR imaging findings. Each MR image was evaluated to determine the anterior obliquity of the lateral tibial plateau (AOLTP), posterior obliquity of the lateral tibial plateau (POLTP), lowest point of the lateral femoral condyle (LPLFC), posterior lateral condylar angle (PLCA) and posterior medial condylar angle (PMCA). Statistical analyses were performed to determine the differences between the two groups.ResultsThe POLTP was significantly larger, the LPLFC was significantly more lateral, and the PLCA was significantly smaller in the DLM group than in the control group (p < 0.001, p < 0.001 and p < 0.001 respectively). However, there was no statistically significant difference in the AOLTP or PMCA between the two groups (p = 0.429 and p = 0.148, respectively).ConclusionsHypoplasia of the lateral femoral condyle and posterior lateral tibial plateau is recognized in juvenile patients with a complete DLM on coronal and axial MRI images.Level Of EvidenceDiagnostic study, Level III.© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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