TKA Design

Question 0

Previous patellectomy and inflammatory arthritis are indications for what TKA design?

Answer 0

Cruciate substituting

Question 1

Indications for cruciate retaining TKA?

Answer 1

Intact PCL
Valgus < 15 degrees
Varus < 10 degrees

Question 2

Give 3 indications for constrained TKA?

Answer 2

1) Neuropathic arthropathy (minimal bone loss- non hinged; massive bone loss- hinged)
2) Attenuation of MCL and or LCL (non hinged)
3) global ligament deficiency (hinged)
4) Tumor (hinged)
5) Post polio (hinged)

Question 3

What is the theoretical advantage of a mobile bearing TKA?

Answer 3

Reduces polyethylene wear by increasing contact area

Question 4

What is a complication of increased constraint implants?

Answer 4

Aseptic loosening