8.22 Hip fx 2 Flashcards
What types of surgical interventions may be done for a hip fx?
- THA
- pinning/screwing
- plate
- IM rod
Why would a THA be done just for a fx?
- if the fx is bad enough
- if they had OA to begin with and were likely to have a THA in the future (may do either a full or hemi)
Why do a hemi-arthroplasty?
- acetabulum is a thin structure
- will run out of bone for the acetabular component if you keep replacing them
What is replaced in a hemi-arthroplasty?
head (neck, shaft, ball)
IM rod
intramedullary rod
Why is an intertrochanteric fx difficult to stabilize?
- direction of forces - femur “wants” to slide up
IM rod structure
- tight fit to prevent pistoning
- distal screw for the same
- not cemented
Surgery puts the pt at greater risk for these:
- AVN
- future hip replacements
(due to damage)
WB post surgery?
typically WBAT immediately
Why does the prosthetic have such a short shelf life? Why revisions?
- surfaces they’re attached to wear down
- cement wears down
- cement fills porous spaces and prevents blood flow
- OP or stress wears down
- pain
- loosening of prosthetic
Where is the avascular portion following THA?
between the prosthesis and bone at the cement/bone interface
What criteria must implants meet?
- strength and durability
- biocompatibility
- anatomically correct
- high standard of production
Why is biocompatibility so important?
previous components resulted in metal leaching into the pt’s blood
What does it mean by “high standard of production”?
no lemons
