Knee

Question 1

What causes the screw-home mechanism?

Answer 1

Medial femoral condyle is bigger than the lateral one, and it has to rotate faster to keep up with the lateral one.

Question 2

Normal Q angle

Answer 2

13°-19°

Question 3

Medial Collateral Ligament (MCL)

Answer 3

• Provides medial stability for the knee
• Limits knee abduction?
• Some fibers of pes anserinus muscles attach to it

Question 4

Lateral Collateral Ligament (LCL)

Answer 4

• Provides lateral stability for knee
• IT band

Question 5

Posterior cruciate ligament (PCL)

Answer 5

• Posterior stability
• Prevents posterior movement of tibia

Question 6

Anterior cruciate ligament (ACL)

Answer 6

• Posterior stability
• Prevents anterior movement of tibia