Discoid Meniscus

Definition: A discoid meniscus is an abnormally shaped meniscus within the knee joint. The meniscus is a C-shaped wedge of cartilage that helps support and cushion the knee joint. In each knee there are two menisci, one on the inside (medial) and one on the outside (lateral) of the knee joint. In some people the lateral meniscus is shaped more like a solid disc rather than the normal C-shape.

Most people with a discoid meniscus never know they have it! Many people live normal, active lives with a discoid meniscus--even high performance athletes. Therefore, if your doctor finds that you have a discoid meniscus, but it is not the cause of your symptoms, it would be left alone.

In some people, the discoid meniscus can cause problems, usually a popping sensation with pain over the outside part of the knee joint. This is why some people use the phrase 'popping knee syndrome' when talking about a discoid meniscus. In these patients, conservative treatment consisting of exercises and stretching can be performed. If these treatments do not relieve the symptoms, patients may choose arthroscopic surgery on the discoid meniscus. If the discoid meniscus is torn, the torn portion can be removed. In addition, the discoid meniscus can be shaved into a more normal appearing meniscus.