What is the meaning of red marrow and other findings in a knee MRI?

Hi doctor,

I just had a magnetic resonance imaging (MRI) done, and I am confused by the red marrow finding. Does that mean bruise or trauma?

See attached reports:

Procedure: MRI knee without contrast 73721

Reason for study: Left knee pain

Additional clinical history: None

MRI scan of left knee:

Technique: Sagittal and coronal proton density-weighted sequences, sagittal STIR sequences, coronal proton density fat-suppressed sequences, and axial proton density fat-suppressed sequences were obtained in the knee.

Comparison: There are no prior pertinent studies available for comparison.

Findings:

Mensci:

• Medial meniscus: There is a complex tear of the medial meniscus. There is a horizontal tear in the body of the medial meniscus surfacing to the inner one-third as well as a subtle radial tear involving the body of the medial meniscus.

• Lateral meniscus: No meniscal tear.

Ligaments:

• Anterior cruciate ligament: The anterior cruciate ligament is intact.

• Posterior cruciate ligament: The posterior cruciate ligament is intact.

• Medial collateral ligament: The superficial and deep components of the medial collateral ligament are intact.

• There is no significant periligamentous edema.

• Lateral collateral imaging: The lateral collateral ligament is intact.

so sorry!

Hi doctor,

One more question. What is Patellofemoral compartment: Mild grade I chondromalacia. Medial compartment: Focal grade III chondromalacia. And do you think this tear can be surgically repaired?