TKR Implants
IMPLANT Choice
There are 3 key components in TKR implant choice: CR vs PS, Patellar resurfacing, and type of bearing.
Exit Exams MCQ QUIZ
According to the principle of the 'condylar compromise' in TKR implant design, what is the direct consequence of increasing implant conformity to reduce contact stress?
What is the primary purpose of a Medial Pivot Knee design?
Which of the following is listed as a primary advantage of a Cruciate Retaining (CR) TKR implant compared to a Posterior Stabilized (PS) implant?
A. It is a bone-preserving procedure as no box cut is needed.
B. It is easier to achieve soft tissue balance.
C. It provides a more congruent joint surface.
D. It eliminates the risk of cam jump and tibial post wear.
What is a potential downside of using stems in TKR components, as identified in the source material?
A. They increase tibial lift-off in cases of varus/valgus instability.
B. They are unable to effectively resist shear forces.
C. They cause stress shielding, which can reduce bone density.
D. They increase micromotion at the implant-bone interface.
Why might an all-polyethylene (All-PE) tibial component be chosen over a metal-backed modular design?
A. It has no back side wear, which eliminates a source of osteolysis.
B. It offers greater modularity with more size and thickness options.
C. It is made of titanium for better osseointegration.
D. It allows for easy liner exchange during revision for infection.
The Knee Arthroplasty Trial (KAT) compared several factors in TKR. What did its 2-year results show regarding patellar resurfacing, mobile bearings, and metal backing?
A. Patellar resurfacing significantly reduced anterior knee pain.
B. There was no difference in functional outcomes for these three factors.
C. Mobile bearings had significantly better functional outcomes.
D. Metal-backed components had a lower revision rate.
The wicked are overthrown and are no more, but the house of the righteous will stand. Proverbs 12:7