TKA

Question 1

What is femoral rollback?

Answer 1

Posterior translation of the femur with progressive flexion

Question 2

What controls rollback in the native knee?

Answer 2

ACL and PCL

Question 3

What is constraint?

Answer 3

Ability of prosthesis to provide varus/valgus and flexion/extension stability in setting of bone loss or ligamentous laxity

Question 4

what causes a cam jump?

Answer 4

loose flexion gap or in hyperetension, cam can rotate over the post and dislocate

Question 5

what is the treatment for a dislocated TKA 2/2 cam jump?

Answer 5

closed reduction with anterior drawer maneuver

Question 6

what is patellar clunk syndrome?

Answer 6

scar tissue gets caught in box as knee moves into extension

Question 7

which condyle is larger?

Answer 7

medial

Question 8

What is the purpose of the trochelar groove?

Answer 8

allows for patellar articulation

Question 9

What is the significance of the intercondylar notch?

Answer 9

origins of cruciate ligaments

Question 10

what bony landmark is used to determine femur rotation?

Answer 10

epicondylar axis and posterior condylar axis