Moderate knee joint effusion.
High signal well within the intercondylar notch with a partial-thickness tear inferiorly of the femoral insertion of the posterior cruciate ligament (best see on the coronal sequence). Anterior cruciate, and medial and lateral collateral ligaments are intact. No meniscal tear.
Mild high signal of the distal semimembranosus insertion, however, the remaining posteromedial corner structures appear uninjured. Extensive posterior capsular oedema in keeping with a hyperextension injury.
Bone marrow oedema and low T1 signal through the proximal tibial epiphysis anteriorly associated periosteal oedema. Effusion in the adjacent deep infrapatellar bursa. Minor focus of oedema in the anterior aspect of the lateral femoral condyle.
Muscle belly oedema within the fibular attachment of the soleus with periosteal stripping of the posterior fibula. Moderate oedema at the gastrocnemius/soleus interface and overlying the superficial medial gastrocnemius proximal myotendinous junction.