ANAT101 Week Four

During knee flexion, with the femur fixed, the tibia rolls and slides

• Anteriorly

• Posteriorly

Where the male surface of the joint is moving, roll and slide occur in ​ (a)   direction(s)

• opposite
• the same

When the tibia is fixed, during knee extension the femur

• Rolls posteriorly, slides anteriorly

• Rolls and slides posteriorly

• Slides posteriorly, rolls anteriorly

• Rolls and slides anteriorly

Answer explanation

The screw-home mechanism occurs when the knee joint is in

• Full flexion

• Partially flexed

• Full extension

During the screw-home mechanism in full extension, the tibia rotates

• Laterally in the final 40 degrees

• Medially in the final 10 degrees

• Laterally in the final 10 degrees

• Laterally in the final 20 degrees

Lateral rotation causes a tension in the PCL which creates a fulcrum for the PCL to cross over the ACL

• True

• False

Which of the following muscles 'unlocks' the knee from the close-packed position

• Gastrocnemius

• Plantaris

• Popliteus

• Biceps femoris

As knee flexion increases, the contact area of the patella and the femoral condyles moves

• Patella distally, femoral condyles posteriorly

• Patella proximally, femoral condyles anteriorly

• Patella distally, femoral condyles anteriorly

• Patella proximally, femoral condyles posteriorly

The iliotibial band assists the ACL in preventing

• Posterior slide of the tibia on femur

• Anterior slide of the femur on tibia

• Anterior slide of the tibia on femur

Provide a functional movement analysis for the hip joint during the post-clearance phase of a hurdle using the following muscles only:

- Illiopsoas

- Rectus femoris

- Vastus medialis

- Piriformis

- Biceps femoris

- Gluteus maximus