Meniscus

Created by lbh145 

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20 terms · Test 5

What are menisci

Rims of fibrocartilage situated on the articular surface of the tibial plateau

Structure of menisci

Thick at their peripheral but taper to a thin edge at their inner circumference

What does this design do

Deepens the articular facets of the tibia to add stability to the knee and act as a shock absorber

Peripheral boarders are attached where

The rim of the plateau of the tibia by the fibers from the inner surface of the capsule

Lateral menisci forms what

Incomplete circle (o shaped)

Lat meniscus anterior and posterior horns attach where

To the anterior and posterior aspect of the intercondylar eminence of the tibia via the coronary ligament

Anteriorly it receives what (lat men)

Attachment from the quadriceps muscle group

Posteriorly it receives what (lat men)

Attachment from the popliteus muscle and the posterior cruciate ligament

Medial menisci shape

Like a C

Anterior and posterior horns attach where (med men)

To the anterior and posterior aspects of the interchondylar eminence via the coronary ligament of the tibia just as the lat men does

Anteriorly it receives what ( med men)

Receives attachment from quadriceps muscle group & anterior cruciate ligament

Posteriorly it receives what (med men)

Recieves attachment from Medial collateral ligament medially, & semimembranosus muscle

More attachments on medial menisci means what

Decreased mobility which leads to an increase injury rate in comparison to lateral menisci

Transverse ligament does what for menisci

Connects the two menisci for added stability (located on anterior aspect of the tibia)

Menisci are _____ except on the outer edges

A vascular; receives some collateral circulation from the genacular artery ; menisci will not heal after being torn

Menisci protect what

Underlying cartilage & bone ; transmits compression force across the surface of the joint, reducing the load per unit area on the tibiofemoral contact sites

What increases the chance for developing osteoarthritis

The contact area of the knee is reduced by 2 times when menisci are absent

Menisci absorb how much total compression load of the knee

45%

How are menisci injured

Similar to anterior cruciate ligament; when the femur rotates on a fixed tibia, trapping the menisci between the medial and lateral femoral condyles and the medial and lateral tibial condyles

Menisci tears are classified as

Age (acute or chronic), appearance (bucket handle & parrot beak) and direction of the tear (longitudinal & horizontal)

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