  The ACL is a straight, predominantly lowsignal ligament that fans distally as it attaches to the anterior tibial plateau. Usually when there is a complete tear of the ACL, it is simply not visualized. ACL tears are mechanically caused from a valgus force with a rotatory motion resulting in anteromedial rotary instability. 前交叉韧带是一条笔直的，低信号为主的韧带，远心端附着于前胫骨平台。通常当前交叉韧带完全撕裂时，几乎不可见。ACL撕裂的损伤机制为受到外翻及旋转力，导致向前内侧旋转不稳。 Most commonly, ACL tears occur at its proximal femoral attachment; however, they may also occur at its midportion, and rarely at its distal tibial attachment. Characteristic bone bruise pattern includes marrow edema at the posterolateral tibial plateau and the midportion of the lateral femoral condyle. An important associated condition is the Segond fracture. This fracture is an avulsion fracture of the lateral tibial plateau at the insertion of the meniscotibial portion of the lateral capsular ligament. 最常见的ACL撕裂常发生于近端的股骨附着处。但也会发生于中段，远端胫骨附着处较少见。典型的骨挫伤类型包括胫骨平台侧后方和股骨外侧髁中段的骨髓水肿。一严重的并发症为Segond骨折，该骨折为胫骨平台外侧的撕脱骨折，即外侧囊韧带的半月板与胫骨的连接处。 Notes： 1. ACL Anterior Cruciate Ligament 前交叉韧带 2. tibial ['tɪbɪrl] adj. 胫骨的 3. meniscotibial -The coronary ligaments of the knee (also known as meniscotibial ligaments) are portions of the joint capsule which connect the inferior edges of the fibrocartilaginous menisci to the periphery of the tibial plateaus. 来源：每天朗读一段医学影像学英语文章 圈主 深圳市人民医院放射科副主任医师杨敏洁 |
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