Presentation
Painful knee after a sports injury a few days ago.
Patient Data
Moderate size knee joint effusion.
Non-displaced vertical tear mid-posterior medial meniscus. Lateral meniscus is intact. No parameniscal cyst.
Cruciate and medial collateral ligament is intact.
Complete rupture of the distal fibular collateral ligament with proximal ligamentous high signal and redundancy. Partial tear of the biceps femoris tendon insertion onto the fibular head and anterolateral tibia.
Popliteus tendon is avulsed from the lateral femoral condyle with mild marrow edema at the popliteus sulcus. High signal of the arcuate and popliteofibular ligaments.
Quadriceps and patellar tendons are intact with thickening of the prepatellar continuation. Small ossicles at both the origin (chronic tendinopathy) and insertion of the patellar tendon (old Osgood-Schlatters disease).
Bone marrow edema through the medial femoral condyle with associated low T1 signal. Small focus of marrow edema at the outer lateral femoral condyle. Tibiofemoral cartilage is intact.
Case Discussion
This is a case of a lateral collateral ligament complex injury with a complete rupture of the fibular collateral ligament and partial tear of the biceps femoris tendon along with a significant posterolateral corner injury including popliteus tendon rupture and partial or complete tear of the popliteofibular ligament. Medial femoral condyle bone bruise.
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