A Useful MRI Classification for Symptomatic Discoid Lateral Meniscus

• Published in: Knee Surgery and Related Research, 33(0) 2021, 33(0), , pp.31-31
• Main Authors: Jung, Eui Yub, Jeong, Seongmin, Kim, Sun-Kyu, Lee, Sung-Sahn, Ryu, Dong Jin, Wang, Joon Ho
• Format: Article
• Language: English
• Subjects: classification; Discoid meniscus; magnetic resonance imaging; meniscal tear; 정형외과학
• ISSN: 2234-2451; 2234-0726; 1225-1623; 2234-2451
• DOI: 10.1186/s43019-021-00108-0

PURPOSEThe purpose of this study is to classify the discoid lateral meniscus (DLM) according to the signal and shape in magnetic resonance imaging (MRI), and to provide information not only in diagnosis but also in treatment. MATERIALS AND METHODSWe reviewed 162 cases who diagnosed with DLM by MRI and underwent arthroscopic procedures from April 2010 to March 2018. Three observers reviewed MRI findings of all cases and predicted arthroscopic tear using three MRI criteria (criterion 1,2 and 3). Among three criteria, the criterion that most accurately predicts arthroscopic tear was selected. Using this criterion, the cases of predicted tear were named group 1. In addition, group 1 was divided into three subgroups (group 1a, 1b and 1c) by deformation or displacement on MRI and arthroscopic type of tear and procedures were analyzed according to these subgroups. RESULTSThe intra-meniscal signal change itself (criterion 3) on MRI showed the highest agreement with the arthroscopic tear. No meniscal deformation and displacement on MRI (group 1a) showed no specific type of tear and more cases of meniscal saucerization. The meniscal deformation on MRI (group 1b) showed more simple horizontal tears and more cases of meniscal saucerization. The meniscal displacement on MRI (group 1c) showed more peripheral tears and more cases of meniscal repair and subtotal meniscectomy. Comparing arthroscopic type of tear and type of arthroscopic procedure between three subgroups, there were significant differences in three groups (P