Presentation
Four weeks post football injury.
Patient Data
Moderate size knee joint effusion.
Medial meniscus is intact. Discoid lateral meniscus occupying nearly 100% of the articular surface; no focal tear. Similar-sized anterior and posterior horns. Meniscofemoral ligament and posterior meniscocapsular attachments are intact.
No parameniscal cyst formation or meniscal body extrusion.
Anterior cruciate ligament is intact. Full-thickness mid-fiber posterior cruciate ligament rupture. Medial collateral ligament is intact. Minimal high signal of the lateral collateral ligament origin. Popliteus muscle belly edema.
Case Discussion
This case demonstrates a full-thickness (grade 3) posterior cruciate ligament rupture with associated popliteus muscle injury and a grade 2 proximal lateral collateral ligament sprain.
A discoid lateral meniscus was incidentally identified but was not injured.