The lateral meniscus is a fibrocartilaginous band that spans the lateral side of the interior of the knee joint.
It is one of two menisci of the knee, the other being the medial meniscus.
It is nearly circular and covers a larger portion of the articular surface than the medial.
It can be injured or torn by twisting the knee or applying direct force, as seen in contact sports.
The lateral meniscus is grooved laterally for the tendon of the popliteus.
The tendon of the popliteus separates it from the fibular collateral ligament.
The lateral meniscus is less likely to be injured or torn than the medial meniscus.
Diagnosis of lateral meniscus tear is done with McMurray’s test.
Treatment depends on the type and size of the tear.
Small meniscus tears can be treated conservatively, with rest, ice, and pain medications until the pain is under control.
Exercise may be started with gradually increasing intensity, to improve range of motion and decrease swelling.
More severe tears of the lateral meniscus require arthroscopic surgical repair or removal.
Swelling and stiffness of the knee can occur with a torn lateral meniscus.