MSC KNEE EXAM QUESTIONS AND ANSWERS RATED A+
NEW UPDATE ASSURED SATISFACTION.
◉ Why is cobalt-chrome a good material to use? Answer: Corrosion resistant
High wear resistance
#1 material for knee femoral components
◉ What are a few benefits of medical titanium? Answer: strong
lightweight
corrosion resistant
cost-efficient
bio-compatible
◉ What is a good surface for cement? Answer: relatively smooth surface
cannot be abrasive too cement interface
no sharp edges
◉ What is porous coating? Answer: encourages bone on-growth or in-growth
no need for cement
◉ What type of alloy is oxinium? What does it do? Answer: Zirconium
Changes surface into ceramic
◉ What does the Vega knee system do? Answer: changes the surface to a ceramic
◉ UHMWPE? What does it do? Answer: Ultra High Molecular Weight Polyethylene
, Density improves physical and mechanical properties
◉ Why isn't polyethylene a perfect material? Answer: Surface wear produces particles that
stimulate osteolysis
Oxidation causes degradation and weakens the material
◉ What type of surface does the Arc Deposited Plasma Sprayed have? Answer: rough porous
Most common
◉ What is hydroxyapatite? Answer: The calcium-rich crystalline structure of teeth and bones
◉ Who created the trabecular metal? What was so great about it? Answer: Zimmer,
interconnected pores
◉ What progress has been made in polyethylene? Answer: Crosslinking
◉ What type of radius did the traditional knee design have? What is it now? Answer: Multi,
Single
◉ What causes failures of TKA? Answer: infection
polyethylene wear
instability/malalignment
Aseptic loosening
Design issues
◉ What are the 3 arcs of motion? Answer: Screw Home Arc, Functional Arc, Deep Flexion Arc
◉ What happens in the screw home arc? Answer: Knee extends and tibia externally rotates in
reference to the femur
◉ Which arc is used while standing lock knee? What type of motion is it? Answer: Screw Home Arc,
Passive
NEW UPDATE ASSURED SATISFACTION.
◉ Why is cobalt-chrome a good material to use? Answer: Corrosion resistant
High wear resistance
#1 material for knee femoral components
◉ What are a few benefits of medical titanium? Answer: strong
lightweight
corrosion resistant
cost-efficient
bio-compatible
◉ What is a good surface for cement? Answer: relatively smooth surface
cannot be abrasive too cement interface
no sharp edges
◉ What is porous coating? Answer: encourages bone on-growth or in-growth
no need for cement
◉ What type of alloy is oxinium? What does it do? Answer: Zirconium
Changes surface into ceramic
◉ What does the Vega knee system do? Answer: changes the surface to a ceramic
◉ UHMWPE? What does it do? Answer: Ultra High Molecular Weight Polyethylene
, Density improves physical and mechanical properties
◉ Why isn't polyethylene a perfect material? Answer: Surface wear produces particles that
stimulate osteolysis
Oxidation causes degradation and weakens the material
◉ What type of surface does the Arc Deposited Plasma Sprayed have? Answer: rough porous
Most common
◉ What is hydroxyapatite? Answer: The calcium-rich crystalline structure of teeth and bones
◉ Who created the trabecular metal? What was so great about it? Answer: Zimmer,
interconnected pores
◉ What progress has been made in polyethylene? Answer: Crosslinking
◉ What type of radius did the traditional knee design have? What is it now? Answer: Multi,
Single
◉ What causes failures of TKA? Answer: infection
polyethylene wear
instability/malalignment
Aseptic loosening
Design issues
◉ What are the 3 arcs of motion? Answer: Screw Home Arc, Functional Arc, Deep Flexion Arc
◉ What happens in the screw home arc? Answer: Knee extends and tibia externally rotates in
reference to the femur
◉ Which arc is used while standing lock knee? What type of motion is it? Answer: Screw Home Arc,
Passive
