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KMID : 0361620180530050429
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Journal of the Korean Orthopaedic Association
2018 Volume.53 No. 5 p.429 ~ p.434
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Meniscal Extrusions on a Non-Traumatic and Young Knee: Magnetic Resonance Imaging Study
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Sim Jae-Cheon
Jeon Jong-Hyun
Seo Yi-Rak
Park Dae-Won
Nam Tae-Seok
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Abstract
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Purpose: The aim of this study was to assess the size and extrusion of the meniscus in young and non-traumatic knees, especially in Korean males.
Materials and Methods: The participants (n=91 knees, 77 patients) were consecutive patients observed at an orthopedic outpatient clinic who had another problem unrelated to the knee joint. The patients were excluded from the study if they had a history of trauma and pain on the knee joint. The patients received a magnetic resonance imaging (MRI) scan on the knee joint. The size, extrusion, and extrusion ratio of the meniscus on an MRI scan were evaluated.
Results: The mean age of the participants was 21.6±1.1 years (range, 19?24 years). The mean size of the medial meniscus on the coronal plane was 9.0±1.1 mm (range, 7.1?11.9 mm). The extent of extrusion on the coronal plane was 2.0±1.0 mm (range, 0?4.4 mm). The extrusion ratio (extruded size/total size×100) of the medial meniscus on the coronal plane was 22.7%±11.5% (range, 0%?53.7%). The extent of extrusion on the sagittal plane was 1.6±1.1 mm (range, 0?4.0 mm). The extrusion ratio (extruded size/total×100) of the medial meniscus on the sagittal plane was 18.0%±11.9% (range, 0%?40.7%). The incidence of medial meniscal extrusion on the coronal and sagittal plane are 92.3% and 80.2%, respectively. The mean size of lateral meniscus on the coronal plane was 11.1±3.4 mm (range, 7.3?22.9 mm). The extent of extrusion on the sagittal plane was 0.5±0.7 mm (range, 0?2.5 mm). The extrusion ratio of the lateral meniscus on the sagittal plane was 4.0%±6.7% (range, 0%?26.3%). The incidence of lateral meniscal extrusion on the coronal plane was 34.1%. No extrusion of the lateral meniscus was observed on the sagittal plane.
Conclusion: In young and non-traumatic knees, the extrusion of meniscus was common, especially medial meniscus than lateral meniscus.
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KEYWORD
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meniscus, position, magnetic resonance imaging
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