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• Clinical Article •
MRI findings of posterior root tear of the medial meniscus
LI Da  WANG Xian-liang  LIU Cun-bing  LIANG Jie 

DOI:10.3969/j.issn.1674-8034.2015.09.009.


[Abstract] Objective: To determine the value of MRI for diagnosing the posterior root tear of the medial meniscus.Materials and Methods: MR examinations of 70 patients with the posterior root tear of the medial meniscus confirmed by knee arthroscopies were retrospectively reviewed, including 35 patients with posterior root tear of the medial meniscal (the posterior root tear group) and other 35 patients with medial meniscus tear without root tear (control group). The direct signs and the accompanying signs of posterior root tear were analyzed in the coronal, sagittal and axial planes of MRI. The incidences of the signs of posterior root tear were compared between two groups, the sensitivity and specificity with the direct signs of three planes in detecting posterior roots tear were calculated.Results: The incidences of a radial tear in the axial plane, the crack sign in the coronal and the ghost meniscus sign in the sagittal plane on the posterior root tear group were significantly higher than that on the control group (χ2=58.95, P<0.01. χ2=54.96, P<0.01. χ2=45.13, P<0.01). The sensitivity and specificity with the direct signs of three planes in detecting posterior roots tear were 91.43%, 100%, 94.29%, 100%, 85.71%, 94.29%, respectively. The incidences of the medial meniscus subluxation and the subcortical marrow edema deep to the meniscal root anchor on the posterior root tear group were higher (χ2=11.28, P=0.01; χ2=13.03, P<0.01). The incidences of cartilage lesion of medial tibiofemoral joint were no difference between two groups (P=0.12), the severities of cartilage lesion were higher on the posterior root tear group (P<0.01).Conclusions: The findings of posterior root tear of the medial meniscal were characteristic, MRI is a relatively good method for detection of posterior meniscus root tears.
[Keywords] Menisci, tibial；Magnetic resonance imaging；Knee injuries

LI Da The Graduate School of Weifang Medical University, Weifang 261053, China

WANG Xian-liang* Department of Medical Imaging, the People’s Hospital of Weifang, Weifang 261041, China

LIU Cun-bing Department of Medical Imaging, the People’s Hospital of Weifang, Weifang 261041, China

LIANG Jie The Graduate School of Weifang Medical University, Weifang 261053, China

*Correspondence to: Wang XL, E-mail: wangxianliang2011@126.com

Conflicts of interest   None.

Received  2015-06-10
Accepted  2015-07-15
DOI: 10.3969/j.issn.1674-8034.2015.09.009
DOI:10.3969/j.issn.1674-8034.2015.09.009.

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