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What is the range of pore size of cementless porous implants to allow for optimal bony ingrowth?
Less than 1 micron
50 to 400 microns
1,000 to 5,000 microns
10,000 to 50,000 microns
100,000 to 500,000 microns
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Which of the following has been shown to increase the rate of failure of cemented femoral components in total hip arthroplasty?
Stems that are precoated with polymethylmethacrylate
Calcar contact of the collar
Smoother implant corners
Cement mantle of 2 millimeters
Stem material with a Young's modulus higher than 115 GPa
Osteopenia has what effect on the strength of the bone-cement interface in comparison to normal bone?
improved mechanical integrity (higher fracture resistance)
diminished mechanical integrity (low fracture resistance)
reduced depth of cement penetration into bone
less affected by cement pressurization
In animal models, which of the following is true when comparing hydroxyapatite(HA)-coated femoral stems to identical non-HA porous-coated stems after implantation?
Grit-blasted stems have decreased rates of loosening
Hydroxyapatite-coated stems have shorter time to biologic fixation
Harris hip scores are higher after porous-coated stem insertion
Transient thigh pain is increased after hydroxyapatite-coated stem insertion
Porous-coated stems show increased rates of calcar atrophy