Kijima Hiroaki, Miyakoshi Naohisa, Kasukawa Yuji, Ishikawa Yoshinori, Kinoshita Hayato, Ohuchi Kentaro, Suzuki Masazumi, Kaga Nozomi, Sato Chie, Chida Shuichi, Shimada Yoichi
Department of Orthopedic Surgery, Akita University Graduate School of Medicine, 1-1-1 Hondo, Akita 010-8543, Japan.
Akita Sports, Arthroscopy, and Knee Group (ASAKG), 1-1-1 Hondo, Akita 010-8543, Japan.
Adv Orthop. 2017;2017:6793026. doi: 10.1155/2017/6793026. Epub 2017 Apr 16.
. Medial meniscal extrusion (MME) has attracted attention as an index of knee pain in conjunction with clinical symptoms that could be more useful than the diagnosis of knee osteoarthritis on X-ray. However, the size of MME that would cause knee pain has not been clarified. The aim of the present study was to investigate the cut-off value of MME for knee pain. . A total of 318 knees were evaluated. The presence of current or past knee pain was confirmed by interview. Next, MME was measured using vertical sonographic images of the medial joint spaces during weightbearing. . Overall, 71 knees were painful (P-group), and 247 knees were not (N-group). MME was 5.9 ± 1.8 mm in the P-group and 2.9 ± 1.5 mm in the N-group ( < 0.0001). Analysis of the receiver operating characteristic curve showed that the cut-off value of MME for knee pain was 4.3 mm, with sensitivity of 0.8451 and specificity of 0.8502. In addition, 64% of knees without pain cases at the time of examination whose MME exceeded this cut-off value had past knee pain. . The sensitivity and specificity of MME for knee pain were very high with a cut-off value of 4.3 mm.
内侧半月板挤出（MME）作为膝关节疼痛的一个指标，连同临床症状一起受到关注，它可能比X线诊断膝关节骨关节炎更有用。然而，导致膝关节疼痛的MME大小尚未明确。本研究的目的是调查MME导致膝关节疼痛的临界值。
总共评估了318个膝关节。通过访谈确认当前或过去是否存在膝关节疼痛。接下来，在负重期间使用内侧关节间隙的垂直超声图像测量MME。
总体而言，71个膝关节疼痛（P组），247个膝关节无疼痛（N组）。P组的MME为5.9±1.8毫米，N组为2.9±1.5毫米（P<0.0001）。对受试者工作特征曲线的分析表明，MME导致膝关节疼痛的临界值为4.3毫米，敏感性为0.8451，特异性为0.8502。此外，在检查时MME超过该临界值的无疼痛病例的膝关节中，64%曾有过膝关节疼痛。
MME导致膝关节疼痛的临界值为4.3毫米时，其敏感性和特异性非常高。
