Knee 4 Flashcards
What are synovial plica?
Remnant of 3 embryotic parts of the knee that if they remain can cause recurrent snapping and pain in the knee.
What are mnost synovial plica like?
Small and asymptomatic.
What should be done with synovial plica?
No pain then leave alone, but if there is pain then they should be checked out.
What are the menisci made of?
Fibrocartilagenous.
How will the menisci help the joint articulation to fit?
Deepen socket and increases stability and congruency. Allow for flexible socket and this accommodates the egg shaped femoral condyles.
The menisci accommodate what type of movement? Why?
Slide which decreases shear
How will the menisci help reduce compression?
Force is directed to peripheray away from articular surfaces.
How much of the compressive load will the lateral and medial menisci direct to the periphery?
Lateral- 70%. Medial- 50%.
With a partial and a total meniscectomy how much wear and tear increase will occur?
Partial- 50-60% increase in wear and tear. Total- 200-235% increase.
What are the shapes of the lateral and medial meniscus?
Lateral- o shaped. Medial- C shaped.
What are the designs of the lateral and medial meniscus and which one is injured most often?
Medial- skinnier, thinner, more fixed and is injured most often. Lateral- Stronger, more mobile and only about 25% of meniscus tears happen in the lateral menisci.
What happens to the synovial fluid of the knee joint complex when the knee is flexed?
It is squeezed in a posterior direction.
Where will the coronary ligaments attach to?
Inferior- tibia and menisci. Superior femur and menisci.
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Name the other attachments of the menisic besides the coronary ligaments?
Medial collateral ligament, Intercondylar area, intermeniscal ligament, posterior meniscofemoral ligament, anterior meniscofemoral ligament, popliteus, semimembranosus.
What is another name for the posterior meniscofemoral ligament and what is its purpose?
Wrisberg and it stabilizes the posterior horn.
What is another name for the anterior meniscofemoral ligament and what is its purpose?
AKA humphry and I don’t know its purpose but it is rare.
What part of the menisci will the popliteus and semimembranosus attach to?
Popliteus- lateral meniscus. Semimembranosus- medial meniscus.
What happens to the menisci with flexion of the knee?
They slide posterior.
Which menisci will slide posterior the most with knee flexion and why?
Lateral because it is not attached to the Lateral collateral ligament.
When flexed at the knee where will the focal weight bearing be at?
The posterior horn.
Deep squats (over 90 degrees) will increase stree where?
Posterior horns.
cartilage compression of the patellofemoral joint will increase with what knee position?
It is squeezed in a posterior direction.
What will support the posterior horn and the lateral meniscus?
Popliteus and meniscofemoral ligaments.
What happens to the menisci with knee extension?
They slide anterior.
Which menisci will slide anterior more with knee extension?
Lateral.
Which menisci will deforme more with knee extension and why?
Medial because it is attached to the medial collateral ligament.
What position is the knee in while fully extended?
Tight packed.
What is the pressure on the menisici like with full extension?
More spread out so pressure is less.
What happens to the synovial fluid of the knee joint complex when the knee is extended?
It shifts anterior.
How will the menisci move with knee rotation?
With the femur and opposite the tibia.
