Presentation
Knee pain
Patient Data
Menisci
Medial meniscus: grade 2 degenerate posterior horn medial meniscus with high signal extending to superior articular surface.
Lateral meniscus: intact
Ligaments
Cruciate ligaments: 50% partial thickness ACL tear at tibial attachment. Normal PCL.
Medial collateral ligament: superficial and deep components intact. No periligamentous edema.
Lateral collateral ligament: intact
Posterolateral corner structures: intact
Extensor mechanism
The distal quadriceps and patellar tendons are intact. The patella is normally positioned within the femoral groove. There is no retinacular disruption.
Fluid
No joint effusion. No Baker’s cyst.
Osseous and articular structures
Bones: no fractures, stress reaction or osseous lesion is seen.
Patellofemoral compartment: no hyaline cartilage disease.
Medial compartment: no hyaline cartilage disease.
Lateral compartment: no hyaline cartilage disease.
Conclusion
Chronic injury with grade 2 degeneration periphery of posterior horn medial meniscus.
50% partial thickness ACL disruption close to tibial insertion.
No osseous or cartilaginous abnormality.
Case Discussion
A good example of partial thickness anterior cruciate ligament tear wherein fluid signal intensity is seen replacing the normal fibers.