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    Title: Parameniscal cyst formation in the knee is associated with meniscal tear size: An MRI study
    Authors: Wua, Chia-Chun;Hsub, Yi-Chih;Chiuc, Ying-Chun;Changd, Yue-Cune;Leee, Chian-Her;Shena, Hsain-Chung;Huangb, Guo-Shu
    Keywords: Knee joint;Meniscal tear;Parameniscal cyst;Magnetic resonance imaging
    Date: 2013-12-01
    Issue Date: 2016-01-06 11:26:56 (UTC+8)
    Abstract: Background
    The relationship between meniscal tears and parameniscal cyst formation is contentious. We investigated whether the development of a parameniscal cyst is related to the size of the meniscal tear by using magnetic resonance imaging (MRI).
    Methods
    On the basis of a retrospective review of an MRI database, we identified parameniscal cysts in 34 patients with adjacent meniscal tears extending to the meniscocapsular junction. The size of the meniscal tear was measured by dividing the length of the tear along two axes: circumferential and radial. We compared parameters, such as the size of the meniscal tear, the location of the tear, the pattern of each tear, and any associated ligamentous injury and intra-articular lesion, between the 34 patients and the 30 control patients who only had meniscal tears with torn components extending to the meniscocapsular junction.
    Results
    Compared with the controls, patients with parameniscal cysts had significantly larger meniscal tears along the circumferential axis (P < 0.001). A critical size of the meniscal tear along the circumferential axis of 12 mm was associated with the formation of a parameniscal cyst.
    Conclusions
    A larger meniscal tear extending into the meniscocapsular junction is more likely to be associated with the occurrence of a parameniscal cyst. The critical size of the meniscal tear, 12 mm along the circumferential axis as identified using MRI, is a discrimination value for parameniscal cyst formation. Level of Evidence: Level
    Relation: The Knee 20(6), pp.556-561
    DOI: 10.1016/j.knee.2013.03.008
    Appears in Collections:[數學學系暨研究所] 期刊論文

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