Time-Dependent Increase in Medial Meniscus Extrusion after Medial Meniscus Posterior Root Tear Analyzed by Using Magnetic Resonance Imaging
- Author:
Yoshiki OKAZAKI
1
;
Takayuki FURUMATSU
;
Yasunori SHIMAMURA
;
Kenta SAIGA
;
Hideki OHASHI
;
Takahiko UCHINO
;
Yusuke KAMATSUKI
;
Yuki OKAZAKI
;
Toshifumi OZAKI
Author Information
- Publication Type:Original Article
- Keywords: Medial meniscus; Root tear; Extrusion; Magnetic resonance imaging; Risk factors
- MeSH: Body Mass Index; Cross-Sectional Studies; Female; Humans; Joints; Magnetic Resonance Imaging; Male; Menisci, Tibial; Retrospective Studies; Risk Factors; Tears
- From:The Journal of Korean Knee Society 2019;31(2):120-125
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: 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. MATERIALS AND METHODS: 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. RESULTS: 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 (R²=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 (R²=0.432). CONCLUSIONS: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. LEVEL OF EVIDENCE: V, Cross-sectional study
