Overview

The lateral meniscus is the rounded, crescent-like pad of fibrocartilage between the femur and tibia on the outside of the knee. It distributes load, absorbs shock, improves joint fit and helps the knee move smoothly.

Location and Attachments

Sits on the lateral tibial plateau
Anchors to the tibia through anterior and posterior horns
Has a gap near the popliteus tendon that allows more movement
Does not attach directly to the LCL
Is generally more mobile than the medial meniscus

What It Does

The lateral meniscus carries a substantial part of the load through the outer knee. Its wedge shape deepens the relatively flat tibial surface and improves joint congruence. It also supports lubrication, proprioception and secondary stability.

Blood Supply and Healing

Only the peripheral portion has a meaningful direct blood supply; the inner portion is relatively avascular. Tear location affects healing potential, but it is not the only factor. Tear shape, stability, tissue quality, symptoms and activity goals all influence management.

Common Problems

Traumatic tear during loaded rotation
Tear associated with ACL injury
Degenerative tear
Meniscal cyst related to a horizontal tear

Outer joint-line pain can also come from the LCL, iliotibial band, cartilage or proximal tibiofibular joint.

Clinical Relevance

A scan should be interpreted alongside symptoms and examination because meniscal changes can exist without being the main pain source. True locking after injury, rapid swelling or inability to bear weight deserves assessment.

References

StatPearls. "Anatomy, Bony Pelvis and Lower Limb, Knee Lateral Meniscus." https://www.ncbi.nlm.nih.gov/books/NBK519494/
StatPearls. "Knee Meniscal Tears." https://www.ncbi.nlm.nih.gov/books/NBK431067/

Lateral Meniscus