Meniscal tear

Written by Dr Sheila Strover on March 14, 2025

A meniscal tear is a tear through the substance of the meniscus, the shock absorber of the knee.

An illustration of a longitudinal tear or circumferential tear of the meniscus.

Illustration of a meniscus to show a longitudinal tear.

How do meniscal tears happen?

Although the meniscus can become degenerate with age, usually a tear is a result of an injury.

This may be a blow on the side of the knee, or a non-contact injury like twisting the body while the foot is on the ground, such as kicking a ball.

"Not all meniscal tears are correctly attributable to an acute injury: degenerated meniscal cartilage may fail under simple load conditions. By contrast, resilient meniscal tissue will tear only with substantial trauma."

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Diagnosing a meniscus tear

Most tests or meniscal tears involve trying to elicit a painful click in the joint. Here you see a surgeon performing the McMurray test.

mcmurray

"...physical examination is a useful and important diagnostic technique and is as reliable as MRI to diagnose meniscal tears. We recommend the use of MRI for more doubtful, difficult and complex knee injuries."

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Options for management of meniscal tears

A small meniscus tear of the inner rim may be of little consequence. Larger tears may disrupt the mechanics of the meniscus by damaging the integrity of the fibre bundles.

The surgeon may use his discretion as to whether the damaged part should be removed (meniscectomy) or repaired (meniscal repair), but this will usually depend upon the location of the tear and the nature of the tear.

To preserve the meniscal functions, meniscal repair should be considered as the first option for meniscus injury. Although reoperation rates are higher after meniscal repair compared with arthroscopic partial meniscectomy, long-term follow-up of meniscal repair demonstrated better clinical outcomes and less severe degenerative changes of osteoarthritis compared with partial meniscectomy.

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