Findings of transient lateral patellar dislocation • “Kissing contusions” at the medial patellar facet and anterolateral aspect of the lateral femoral condyle from impaction event • Patellar and femoral trochlear cartilage injury. • Medial patellar retinaculum injury. • Knee joint effusion.
What is O Donoghues unhappy triad? O Donoghues unhappy triad is a common football and skiing injury that occurs as a result of valgus stress and twisting motion during weight bearing. Classically, MCL injury, ACL tear, and medial meniscal tear constitute this triad.
What structures are present at the posterolateral corner of the knee, and why are they important? The posterolateral corner structures stabilize the knee from varus and rotatory stresses. They consist of the LCL complex, the popliteus muscle and tendon, the lateral head of the gastrocnemius tendon, as well as the arcuate, fabellofibular, and popliteofibular ligaments. …
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How is ligamentous injury graded on MRI? Ligamentous injury can be graded as I, II, or III. • Grade I (sprain): Edema around an intact ligament. • Grade II (partial tear): Edema within ligament and in surrounding tissue. • Grade III (complete tear): Complete disruption of ligament.
What comprises the lateral collateral ligament complex? The LCL complex consists of the following from anterior to posterior: • Iliotibial band attaching to the Gerdy’s tubercle of the tibia • Fibular collateral ligament between the lateral femoral condyle and the fibular head • Biceps femoris tendon inserting into the fibular head
What comprises the medial collateral ligament (MCL)? The MCL can be divided into a deep layer and a superficial layer. The deep layer consists of the meniscofemoral and meniscotibial ligaments, and the superficial layer consists of the tibial collateral ligament.
some secondary MRI findings of ACL rupture • Anterior translation of the tibia in relation to the femur by greater than 7 mm. • Segond fracture: an avulsion fracture from the lateral tibial plateau by the lateral capsular ligament. • “Kissing contusions” in the anterior aspect of the lateral femoral condyle and posterior aspect of the lateral tibial plateau …