Total Knee arthroplasty

Question 1

what direction do you aim when doing knee injections

Answer 1

• inferior slightly due to 7 degree tibial slope posteriorly

- towards notch

Question 2

what is femoral rollback . . . normal motion of native knee

Answer 2

• the femur rolls posteriorly on the tibia when the knee flexes
• instigated by PCL

Question 3

What part of the MCL is more important for stability, deep or superficial?

Answer 3

• Superficial . . resists valgus force

- Deep portion is routinely peeled back as part of the exposure

Question 4

What nerve is sometimes cut during a midline skin incision for TKA

Answer 4

-infrapatellar branch of the saphenous nerve, leading to medial inferior knee numbness

Question 5

What increases when you go up a size on a femoral component of a TKA

Answer 5

Anterior posterior dimensions

Question 6

What component of the prosthesis helps prevent rotation of the tibial tray

Answer 6

keel

Question 7

If both your extension and flexion gaps are too tight, what can you resect to improve both at once

Answer 7

Tibia