Hyperextension knee injury
Knee pain post injury.
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Moderate size knee joint effusion. Extensive hyperintensity around the posterior knee joint capsule as well as a proximal myotendinous junction injury of the lateral gastrocnemius head.
Menisci are intact. Cruciate ligaments are intact. Medial collateral ligament is intact.
Intrinsic hyperintensity of the proximal lateral collateral ligament with marrow edema at its insertion as well as disruption of the deep fibers. Hyperintensity of the arcuate ligament. Remaining posterolateral corner structures appear uninjured.
Quadriceps and patellar tendons are intact.
Marrow contusion of the anterior distal femur involving the trochlea but centered on the medial femoral condyle with reciprocal marrow contusion of the anterior aspect of the medial tibial plateau.
Hyperextension mechanism of injury with typical "kissing contusions" of the anterior knee joint. There is a high-grade 2 injury of the proximal lateral collateral ligament with a posterior capsular sprain, arcuate ligament sprain and lateral gastrocnemius proximal myotendinous junction injury.