Abstract
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 < .05).ConclusionsIntra-meniscal signal change itself on MRI is the most accurate finding to predict arthroscopic tear in symptomatic DLM. In addition, subgroup analysis by deformation or displacement on MRI is helpful to predict the type of arthroscopic tear and procedures.
Highlights
Discoid lateral meniscus (DLM) is a congenital variant with a prevalence of about 0.5% in whites and 15% in Asian populations [1,2,3,4]
Intra-meniscal signal change itself on Magnetic resonance imaging (MRI) is the most accurate finding to predict arthroscopic tear in symptomatic DLM
Subgroup analysis by deformation or displacement on MRI is helpful to predict the type of arthroscopic tear and procedures
Summary
Discoid lateral meniscus (DLM) is a congenital variant with a prevalence of about 0.5% in whites and 15% in Asian populations [1,2,3,4]. Many patients with DLM may remain asymptomatic. Magnetic resonance imaging (MRI) is essential for the diagnosis of DLM. MRI provides clear criteria for the diagnosis of DLM and has high specificity and sensitivity [10,11,12]. Few studies have suggested MRI findings that can predict a DLM tear. The DLM is thick and occupies most of the lateral compartment and is deformed in many cases, so the arthroscopic view is poor. The preoperative MRI findings that can accurately predict the arthroscopic tear are essential
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