• Hong-De Wang and Shi-Jun Gao.
• aDepartment of Orthopedics, Third Hospital of Hebei Medical University bOrthopaedic Biomechanics Laboratory of Hebei Province, Shijiazhuang, Hebei, People's Republic of China.
• Medicine (Baltimore). 2017 Nov 1; 96 (46): e8637.

RationaleBilateral discoid medial menisci is an extremely rare abnormality of the knee joint. The presence of a discoid medial meniscus has been associated with magnetic resonance imaging (MRI) and radiographic changes in the tibial region, such as cupping of the medial tibial plateau and tibial physis collapse. While discoid medial meniscal tears with hypoplasia of the femoral medial condyles have not been previously reported. Herein, we report a case of bilateral discoid medial menisci associated with meniscal tears and femoral bone changes.Patient ConcernsA 28-year-old man presented with left knee pain and restricted range of motion; the right knee was asymptomatic.DiagnosesBased on radiographic and MRI findings, he was diagnosed with bilateral discoid medial meniscal tears.InterventionsPartial meniscectomy and reshaping were performed for the torn discoid medial meniscus of the left knee only.OutcomesMRI revealed short, flattened femoral medial condyles in the coronal and sagittal planes, and hypoplasia of the femoral medial condyles in the axial plane; these findings were confirmed arthroscopically in the left knee. The patient had a satisfactory results at the 12-month follow-up.LessonsThis case indicates a potential link between discoid medial menisci and hypoplasia of the femoral medial condyle. We recommend preservation of the discoid medial meniscus in asymptomatic patients, while arthroscopic partial meniscectomy and reshaping is recommended in symptomatic patients.

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