Abstract
：Objective To determinethe value of MRI for diagnosing the posterior meniscus root tear. Methods MR examinationsof 30 patients with tear of the posterior meniscus root confirmed by knee arthroscopieswere retrospectively reviewed. Of the 30 patients, 17 with posterior medial meniscus roottear (MMRT) and 13 with posterior lateral meniscus root tear (LMRT). The diagnosticsensitivity of MRI for the posterior meniscus root tear was analyzed. Fisher's exact testwas used to compare the detection rate of MRI for MMRT with that for LMRT. Results All 17cases with MMRT and 9 cases out of 13 with LMRT were correctly diagnosed by MRI and thediagnostic sensitivity of MRI for the posterior meniscus root tear was 86. 7% (26/30). Themain MR appearance of the posterior meniscus root tear was distortion of the meniscalroot, with its low signal replaced by abnormal high signal. The detection rate of MRI forMMRT (17/17)was significantly greater than that for LMRT (9/13) ( P =0. 026). Theprevalence of MMRT associated with meniscus extrusion ( 15/17 ) was significantly greaterthan that of LM RT ( 6/13 ) ( P = 0. 020), but the prevalence of MMRT associated withanterior cruciate ligament (ACL) injury (5/17) was significantly lower than that of LMRT(11/13) (P = 0. 004). Conclusion MRI is a relatively good method for detection ofposterior meniscus root tears and associated injuries.
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