Vastus Medialis and Vastus Lateralis in Patellar Stabilization

Play an AI-generated podcast conversation about this lesson

Which muscle is primarily responsible for generating varus moment at the knee joint?

Semimembranosus

Gracilis (correct)

Sartorius

Vastus medialis longus

What action can the pes anserinus serve as in patients with knee pain?

Irritation and overuse strain location (correct)

Valgus moment generator

Extension promoter

Flexion and extension stabilizer

Which muscle is NOT part of the pes anserinus insertion site?

Vastus lateralis (correct)

Gracilis

Semimembranosus

Sartorius

What does VMO stand for in relation to the vastus medialis?

Vastus Medialis Obliquus Signup and view all the answers

Which muscle group has the ability to generate valgus moments at the knee joint?

Popliteus Signup and view all the answers

Which fiber orientation of vastus medialis is responsible for generating the varus moment?

VMO fibers Signup and view all the answers

What is the primary restraint to lateral migration of the patella?

Vastus medialis obliquus (VMO) Signup and view all the answers

Which muscle generates a lateral pull slightly higher than the medial pull for the patella?

Vastus lateralis Signup and view all the answers

What is the angle at which both vastus lateralis and vastus medialis generate a stabilizing force for the patella?

55° Signup and view all the answers

Why is it difficult to selectively recruit the VMO portion of the vastus medialis muscle?

Innervation by the femoral nerve Signup and view all the answers

How much compressive force is estimated to be placed on the patellofemoral joint during jogging?

3-4 times body weight Signup and view all the answers

Which activity places approximately 6.7 times body weight compressive force on the patellofemoral joint?

Rising from a chair Signup and view all the answers

What is the primary function of the medial and lateral menisci in the knee joint?

All of the above Signup and view all the answers

Which of the following muscles can create movement in the medial and lateral meniscus, respectively?

Semimembranosus and popliteus Signup and view all the answers

What is the typical anatomical axis angle of the knee joint when the vertical tibia and oblique femur are placed together?

185° Signup and view all the answers

In the condition of genu valgum (knock knees), what is the effect on the joint lines of the tibiofemoral joint?

The lateral joint line is compressed, and the medial joint line is distracted Signup and view all the answers

What is the goal when dealing with injured menisci in the knee joint?

Preservation of the injured meniscus, with repair whenever possible Signup and view all the answers

What is the definition of the mechanical axis of the lower limb?

The line defined by the hip joint and ankle joint, which tends to be neutral (180°) in the absence of anatomical dysfunction Signup and view all the answers