Objective To explore the MRI findings of acute injured medial patellofemoral ligament (MPFL) .Methods 36 cases of acute injured MPFL confirmed by MRI and clinic were retrospectively analysed .The focus was to observe the MRI features of MPFL injury and associated knee pathology .Results Tear of the MPFL at the femoral attachment oc-curred in 17/36 cases ,at the patellar attachment in 11/36 cases ,and at the mid-substance sites in 8/36 cases .Among 36 MPFL injuries ,there were 19 cases with contusion ,11 cases with partial tear ,6 cases with complete tear .Associated findings included subluxation of the patella (11 cases) ,dislaocation of patella (3 cases) ,bone contusion (25 cases) ,osteo-chondral fracture (8 cases) ,medial collateral ligament injury (16 cases) ,vastus medialis oblique injury (17 cases) ,menis-cus injury (15 cases) ,and joint effusion (36 cases) .Conclusion Transaxial MR examination is recommended to evaluate MPFL injury .MRI can clearly diagnose MPFL injury and accurately classify the damage .Associated knee injuries are sug-gestive signs in diagnosing acute M PFL injury .%目的：探讨内侧髌股韧带（M PFL ）急性损伤的M RI表现。方法回顾分析经M RI成像及临床证实的36例急性M PFL损伤患者的M RI资料，观察M PFL及膝关节其它结构损伤的M RI表现。结果36例M PFL损伤中，17例发生股骨侧，11例发生在髌骨侧，8例发生在韧带体部。36例M PFL损伤中，挫伤为19例，部分撕裂11例，完全撕裂6例。36例M PFL损伤中，11例存在髌骨半脱位，3例存在髌骨脱位，25例存在骨挫伤，8例存在骨软骨骨折，16例存在内侧副韧带损伤，17例存在股内侧斜肌损伤，15例存在半月板损伤，36例均有不同程度关节积液。结论 M RI诊断M PFL损伤以横断位最佳。M RI可以对M PFL损伤进行准确诊断和分级，典型的其它结构伴发损伤对诊断急性M PFL损伤有重要提示作用。
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