Knee Joint Function and Anatomy Quiz
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Questions and Answers

What is the normal angle of inclination of the proximal femur?

  • 155 degrees
  • 110 degrees
  • 140 degrees
  • 125 degrees (correct)
  • Which ligament resists valgus stress at the knee?

  • Anterior cruciate ligament
  • Medial collateral ligament (correct)
  • Posterior cruciate ligament
  • Lateral collateral ligament
  • What is the shape of the lateral meniscus?

  • Deeper and more circular (correct)
  • More mobile and less circular
  • Shallow and more oval
  • Semi-lunar (C shape)
  • Which ligament crosses the medial aspect of the knee and blends with the medial patella retinaculum?

    <p>Medial collateral ligament</p> Signup and view all the answers

    What is the function of the meniscus in the knee joint?

    <p>Accept/disperse compression in tibiofemoral joint</p> Signup and view all the answers

    What type of joint motion occurs in the knee joint?

    <p>Hinge joint with 2 degrees of freedom</p> Signup and view all the answers

    What is the primary function of the Posterior Cruciate Ligament (PCL)?

    <p>Resisting posterior translation of the tibia on the femur</p> Signup and view all the answers

    What is the role of the Patellofemoral Joint (PFJ) in the knee joint?

    <p>Creating a longer movement arm for the quadriceps</p> Signup and view all the answers

    What occurs between 90-60° flexion at the Patellofemoral Joint (PFJ)?

    <p>The patella is in contact with the femoral intracondylar groove</p> Signup and view all the answers

    What is the role of the Popliteus muscle in the knee joint?

    <p>Laterally rotates the femur on the tibia to unlock the knee</p> Signup and view all the answers

    What is the primary function of the Ankle joint (talocrural joint)?

    <p>Primarily shock absorption and conforming to ground forces</p> Signup and view all the answers

    What is the weight-bearing load distribution in the foot's mortise joint?

    <p>90% through the talus, tibia, and fibula; 10% through lateral structures</p> Signup and view all the answers

    What is the primary load-bearing and shock-absorbing structure of the foot?

    <p>Medial longitudinal arch</p> Signup and view all the answers

    Which motion occurs at the subtalar joint?

    <p>Pronation and supination</p> Signup and view all the answers

    What is the closed-packed position of the foot?

    <p>Supination</p> Signup and view all the answers

    Which joint accepts the majority of forces in closed-chain activities?

    <p>Talocrural joint</p> Signup and view all the answers

    What is the role of the plantar aponeurosis in foot biomechanics?

    <p>Assists in arch support</p> Signup and view all the answers

    What causes the longitudinal arch of the foot to rise during propulsion?

    <p>Tension on the plantar aponeurosis</p> Signup and view all the answers

    Which joint dictates motion at the midfoot in a closed-chain position?

    <p>Subtalar joint</p> Signup and view all the answers

    Study Notes

    Proximal Femur

    • The normal angle of inclination of the proximal femur is 125°.

    Knee Joint

    • The medial collateral ligament resists valgus stress at the knee.
    • The lateral meniscus is semicircular in shape.
    • The medial collateral ligament crosses the medial aspect of the knee and blends with the medial patella retinaculum.
    • The meniscus in the knee joint functions to distribute pressure, reduce friction, and absorb shock.
    • The knee joint operates through rolling-gliding motion.

    Ligaments and Muscles

    • The primary function of the Posterior Cruciate Ligament (PCL) is to resist posterior translation of the tibia.
    • The Patellofemoral Joint (PFJ) helps to reduce friction and improve tracking of the patella during knee movement.
    • Between 90-60° flexion at the Patellofemoral Joint (PFJ), the quadriceps muscle contracts, and the patella glides inferiorly.
    • The Popliteus muscle unlocks the knee joint by rotating the tibia, allowing for full flexion.

    Ankle Joint

    • The primary function of the Ankle joint (talocrural joint) is to allow for dorsiflexion and plantarflexion.

    Foot Biomechanics

    • In the foot's mortise joint, the weight-bearing load is distributed 50% to the talus and 50% to the calcaneus.
    • The primary load-bearing and shock-absorbing structure of the foot is the midfoot.
    • The subtalar joint allows for inversion and eversion motions.
    • The closed-packed position of the foot is in subtalar neutral.
    • The ankle joint accepts the majority of forces in closed-chain activities.
    • The plantar aponeurosis in foot biomechanics helps to support the medial longitudinal arch and plantarflex the foot.
    • During propulsion, the longitudinal arch of the foot rises due to the plantar aponeurosis and flexor hallucis longus muscle.
    • The midtarsal joint dictates motion at the midfoot in a closed-chain position.

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    Description

    Test your knowledge of the knee joint with this quiz covering its functions, movements, and the influence of anatomy and muscles on its range of motion. Explore the key joints, motions, and forces involved in activities such as walking, running, and supporting body weight.

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