THA Stability

Question 1

What are 4 important variables that determine hip stability?

Answer 1

1) component design
2) component position
3) soft-tissue tensioning
4) soft tissue function

Question 2

What THA component design features can affect stability?

Answer 2

1) Increased head-neck ratio
2) Elevated rim liner
3) Lateralized liner

Question 3

What are techniques to increase offset in THA?

Answer 3

1) increasing length of femoral neck (hi offset)
2) decreasing neck-shaft angle
3) medializing the femoral neck while increasing femoral neck length
4) trochanteric advancement
5) alteration of the acetabular liner

Question 4

What is a common reason for late dislocation of THA?

Answer 4

Eccentric, excessive poly wear