Okazaki Yoshiki, Furumatsu Takayuki, Shimamura Yasunori, Saiga Kenta, Ohashi Hideki, Uchino Takahiko, Kamatsuki Yusuke, Okazaki Yuki, Ozaki Toshifumi
Department of Orthopaedic Surgery, Okayama University Graduate School, Okayama, Japan.
Knee Surg Relat Res. 2019 Jun 1;31(2):120-125. doi: 10.5792/ksrr.18.059.
Medial meniscus posterior root tear (MMPRT) causes progression of medial meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors.
We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the medial meniscus body width, medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated.
The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (=0.432).
The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME.
V, Cross-sectional study.
内侧半月板后根撕裂（MMPRT）会导致内侧半月板挤压（MME）进展。本研究旨在根据两次术前磁共振成像（MRI）扫描结果计算MME的进展率，并确定相关因素。
我们回顾性分析了33例患者（27例女性和6例男性；平均年龄60岁），他们平均间隔48天接受了两次MRI检查。我们测量了内侧半月板体部宽度、内侧关节间隙宽度（MJSW）和MME。MME进展率通过对两次MRI扫描之间MME增加量（ΔMME）的回归分析得出。此外，还评估了MME增加率与年龄、体重指数、股胫角和MJSW之间的相关性。
平均MME从3.4毫米增加到4.5毫米（p<0.001）。观察到ΔMME与MRI扫描间隔之间存在良好相关性（=0.621），MME进展率为每天0.020毫米。观察到MME增加率与MJSW之间存在中度相关性（=0.432）。
MMPRT中MME进展率较快，MJSW变窄与MME进展相关。
V，横断面研究。
