Murata Shohei, Kijima Hiroaki, Saito Kimio, Saito Hidetomo, Miura Takanori, Akagawa Manabu, Tsukamoto Hiroaki, Sasaki Kana, Ebina Toshihito, Nozaka Koji, Miyakoshi Naohisa
Akita Sports Arthroscopy Knee Group (ASAKG), 1-1-1 Hondo, Akita 010-8543, Japan.
Department of Orthopedic Surgery, Kakunodate General Hospital, 3 Iwase, Senboku 014-0394, Japan.
J Clin Med. 2023 Aug 13;12(16):5268. doi: 10.3390/jcm12165268.
Recently, there has been increasing interest in medial meniscal extrusion (MME), but few reports have evaluated MME via X-ray. In this study, the amount of MME and meniscal height at the medial border of the tibia were measured via X-ray with gradation processing. The extrusion length divided by the meniscal height yields the meniscal extrusion ratio, which was used as an index. In addition, the medial meniscal length of the part protruding from the medial border of the tibia on MRI was measured as an absolute value. Then, the correlation between the meniscal extrusion ratio and the amount of MME on MRI was examined, and there was a strong correlation between the meniscal extrusion ratio via X-ray and the amount of MME on MRI (correlation coefficient 0.860, < 0.0001). The cut-off value of the meniscal extrusion ratio via X-ray for positive meniscal extrusion on MRI was 0.50, with an AUC of 0.9825, sensitivity of 0.9063, and specificity of 0.8663. From the present study, it was possible to measure the extrusion length and meniscal height via gradation processing, with X-ray and without MRI, and to calculate the meniscal extrusion ratio, which strongly correlates with the amount of MME on MRI.
近年来，内侧半月板挤出（MME）越来越受到关注，但很少有报告通过X射线评估MME。在本研究中，通过X射线进行灰度处理测量胫骨内侧缘的MME量和半月板高度。挤出长度除以半月板高度得出半月板挤出率，将其用作指标。此外，在MRI上测量从胫骨内侧缘突出部分的内侧半月板长度作为绝对值。然后，检查半月板挤出率与MRI上MME量之间的相关性，并且通过X射线的半月板挤出率与MRI上的MME量之间存在强相关性（相关系数0.860，<0.0001）。MRI上半月板阳性挤出的X射线半月板挤出率的截断值为0.50，AUC为0.9825，敏感性为0.9063，特异性为0.8663。从本研究中，可以通过灰度处理、使用X射线且无需MRI来测量挤出长度和半月板高度，并计算半月板挤出率，其与MRI上的MME量密切相关。
