Lecture250 - OBJECTIVES Examination #3 (Thursday Dec 6th):...

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OBJECTIVES Examination #3 (Thursday Dec 6 th ): Closed book, format same as before. Material covered after Examination 2 Total Hip Arthroplasty – Mechanical evaluation Fracture Fixation-Internal and External Course Wrap-Up: Take Home Message & Key Student Evaluations
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Total Hip Arthoplasty Mechanical Evaluation
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Total Hip Arthoplasty Mechanical Evaluation Force vs. Principal strains 0.00E+00 5.00E-05 1.00E-04 1.50E-04 2.00E-04 0 20 40 60 80 100 120 140 N Strains Intact(prox_max) Implant(prox_max) Intact(dist_max) Implant(dist_max)
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Influence of Lower Strain in Transplanted Hip? Mechanical Adaptation of Bone?
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Influence of Lower Strain in Transplanted Hip? Lower strain after implantation is “interpreted” by remaining bone as “reduced mechanical demand”. Bone, then, models/remodels in response to reduced mechanical demand. Net result: Loss of bone at the bone- implant interface, implant loosening and fracture at the proximal end of the femur.
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Total Hip Arthoplasty Mechanical Evaluation: Wear
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THA Mechanical Evaluation: Wear http://www.kosu.hut.fi/project/hip2001/
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Types of in vivo wear patterns Pitting: Small depression area (< 1 mm dia) from where material has been removed
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Types of in vivo wear patterns Scratching: Unidirectional lines that have been cut into polyethylene
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Types of in vivo wear patterns Burnishing: Shallow multidirectional swirled lines that result in highly polished appearance.
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Types of in vivo wear patterns Abrasion: Roughened texture due to repeated rubbing against a counter-surface.
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This note was uploaded on 09/07/2008 for the course BMED 4540 taught by Professor Vashishth during the Fall '07 term at Rensselaer Polytechnic Institute.

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Lecture250 - OBJECTIVES Examination #3 (Thursday Dec 6th):...

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