目的：外侧副韧带（lateral collateral ligament ，LCL ）和腘肌肌腱复合体（popliteus tendon ，POP-T ）是膝关节后外侧结构（posterolateral corner ，PLC）的主要组成结构，本文拟总结I°～III°PLC损伤各分度中两者的MR改变。方法急性膝关节外伤后体检提示I°～III°PLC损伤患者27例进行MR扫描，分析LCL和POP-T的MR改变，并与关节镜和手术所见对比。结果 I°损伤15例：单纯LCL损伤11例，其中部分撕裂2例；POP-T水肿1例；LCL和 POP-T复合损伤3例。II°损伤7例：LCL损伤3例，均为撕裂；复合损伤4例。III°损伤5例：均为复合损伤，其中3例并骨折。各例关节镜检查并5例同时行开放手术，所见与MR基本相符。结论各分度PLC损伤中LCL和POP-T改变复杂多样，同分度PLC损伤中亦可不同。MR常规扫描具备评价LCL和POP-T不同程度损伤的能力，从而提高PLC损伤分度诊断准确性，以便指导治疗。%Objective To study the MR findings of two major components of knee posterolateral corner (PLC):lateral collateral ligament (LCL) and popliteus tendon (POP-T) in the degree I°~III°of PLC injury .Methods We analysed the MR findings in LCL and POP-T of 27 cases of I°~III°of PLC injury revealed by physical examination after knee acute trau-ma .Results Totle 15 cases I° of PLC injury included :LCL injury alone were found in 11 cases ,which included partial tear in 2 cases ,POP-T edema in 1 case and the combined injury of LCL and POP-T in 3 cases .Totle 7 cases of II° PLC in-jury included LCL tear alone in 3 cases and combined injury in 4 cases .Totle 5 cases of III° PLC injury were all combined injury ,which included 3 cases accompanied by fracture .The findings in operation of II° PLC injury were 2 cases and 3 ca-ses of III° PLC injury were corresponded to MR images .Conclusion The MR findings of LCL and POP-T in the I°~III° PLC injury were varied ,the imaging signs could be different in the same injury degree .MR can show the detail of LCL and POP-T injury and contribute to provide an accurate assessment of I°~III°PLC injury ,which provide more information for clinical treatment .
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