Advanced Rectus Femoris Quiz

Q1. What explains active insufficiency of rectus femoris during combined hip flexion and knee extension?

• The patella moves posterior to the knee axis
• The femoral nerve loses continuity
• The muscle is shortened across both joints
• The muscle is lengthened across both joints

Q2. Which position places rectus femoris under a strong passive stretch?

• Hip extension combined with knee flexion
• Hip flexion combined with knee flexion
• Hip flexion combined with knee extension
• Hip extension combined with knee extension

Q3. Why can the anterior inferior iliac spine be avulsed by rectus femoris in an adolescent athlete?

• The patellar ligament attaches directly to the AIIS
• The direct head exerts traction on the AIIS apophysis
• The femoral nerve anchors the muscle to the ilium
• The reflected head attaches to the ischial tuberosity

Q4. What movement pattern is likely to weaken after a femoral nerve injury involving rectus femoris?

• Ankle plantarflexion with toe flexion
• Foot eversion with dorsiflexion
• Hip extension with knee flexion
• Knee extension with some loss of hip flexion contribution

Q5. Why is rectus femoris at risk for strain during high-speed sprinting?

• It has no proximal tendon
• It remains isometric throughout sprinting
• It crosses only the ankle
• It undergoes rapid loading and length change across two joints

Q6. How does the patella improve the effectiveness of rectus femoris during knee extension?

• It shortens the femur
• It changes rectus femoris into a knee flexor
• It supplies the quadriceps with motor fibers
• It increases quadriceps mechanical leverage

Q7. Why does knee and hip position affect rectus femoris more than vastus intermedius?

• Vastus intermedius receives no femoral nerve supply
• Rectus femoris crosses only the ankle
• Vastus intermedius crosses the hip and knee
• Rectus femoris crosses the hip and knee, while vastus intermedius crosses only the knee

Q8. Which proximal anatomical feature is important when assessing rectus femoris tendon injuries?

• Separate direct and reflected heads
• No proximal tendon component
• A common origin with adductor longus
• A single origin from the ischial tuberosity

Q9. Why does adding knee flexion increase a rectus femoris stretch when the hip is already extended?

• Knee flexion removes tension from the quadriceps tendon
• Knee flexion lengthens the muscle across its second joint
• Knee flexion shortens the muscle across both joints
• Knee flexion changes its nerve supply

Q10. Which statement most accurately integrates rectus femoris anatomy?

• It is a tibial-nerve-supplied hamstring that flexes the knee
• It is a femoral-nerve-supplied biarticular quadriceps muscle that extends the knee and assists hip flexion
• It is an obturator-nerve-supplied adductor that crosses only the hip
• It is a common-fibular-nerve-supplied muscle that dorsiflexes the ankle