THA

Question 1

Most common bug for acute vs delayed (>3mo) infx

Answer 1

Acute: S.aureus
Delayed: Staph epi

Question 2

How will you know there is abductor def after THA? What can you do about it?

Answer 2

RF: direct lateral approach - split glut med
See: Trendelenburg gait
Do: TFL + glut max trs to GT

Question 3

What is the Parprosky classification for tab bone loss

Answer 3

1 - min
2 = <2cm, cup + bone graft augment
2a - up + in
2b - up + out
3 = >2cm bone loss
3a - up + out; cup + bone graft
3b - up + in, pelvic discont, triflange

Question 4

AAOS classification tab bone loss

Answer 4

1 - segmental, lose part of the rim
2 - cavitary, volumetric loss of the tab cavity
3 - combined def, seg bone loss + cav def
4 - pelvic discont
5 - fused

Question 5

What are RF for post op nerve palsy

Answer 5

Sciatic nerve - peroneal branch most common
DDH
Limb lengthening
Post trauma arthritis
Revision // surgeon thinks it was hard 
Women