- Lateral meniscus
Name = Lateral meniscus
Latin = meniscus lateralis
GraySubject = 93
GrayPage = 343
Caption = Head of right
tibiaseen from above, showing menisciand attachments of ligaments.
Caption2 = Left
knee-jointfrom behind, showing interior ligaments.
The lateral meniscus, also called the external semilunar fibrocartilage, is a
fibrocartilaginousband that spans the lateral side of the interior of the kneejoint. 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 occasionally 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, which separates it from the fibular collateral ligament.
Its anterior end is attached in front of the intercondyloid eminence of the
tibia, lateral to, and behind, the anterior cruciate ligament, with which it blends; the posterior end is attached behind the intercondyloid eminence of the tibia and in front of the posterior end of the medial meniscus.
The anterior attachment of the lateral meniscus is twisted on itself so that its free margin looks backward and upward, its anterior end resting on a sloping shelf of bone on the front of the lateral process of the
Close to its posterior attachment it sends off a strong
fasciculus, the ligament of Wrisberg, which passes upward and medialward, to be inserted into the medial condyleof the femur, immediately behind the attachment of the posterior cruciate ligament.
Occasionally a small fasciculus passes forward to be inserted into the lateral part of the
anterior cruciate ligament.
The lateral meniscus gives off from its anterior convex margin a fasciculus which forms the transverse ligament.
Injury and Treatment
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. If a tear is detected, treatment depends on the type and size of the tear. Small tears can be treated conservatively, with rest, ice, and pain medications until the pain is under control, then exercise may be started with gradually increasing intensity, to improve range of motion and decrease swelling. More severe tears of the lateral meniscus require surgical repair or removal, which can often be done arthroscopically.
Meniscal cartilage replacement therapy
* [http://www.kneeguru.co.uk/KNEEnotes/node/848 The KNEEguru - educational site packed with knee content with sections on meniscal injuries]
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Look at other dictionaries:
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