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Backside Wear of Tibial Polyethylene Components is affected by Gait Pattern: A Knee Simulator Study using Motion Analysis as input

Markus A. Wimmer

Department of Orthopedic Surgery, Rush University Medical Center, Chicago (IL)

08 de Janeiro | 14:30 | Auditório da Biblioteca NOVA FCT


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Ideally, standardized wear testing protocols replicate the in vivo motions and forces of TKR patients. In a study with 30 TKR patients, two distinct in vivo gait patterns emerged, one characterized as having low anteroposterior motion and the other high anteroposterior motion. The aim of this study was to determine the effect of the two in vivo-determined gait patterns on total and backside insert wear in comparison with the ISO standard 14243-3. In order to differentiate and accurately quantify topside and backside wear, a novel technique was employed where different lanthanide tracers are incorporated into the polyethylene during manufacture.

Nota Biográfica:
Markus A. Wimmer, Ph.D. is Professor and Grainger Director of the Rush Arthritis and Orthopedics Institute in Chicago and serves as the Associate Chairman for Research in the Department of Orthopedic Surgery at Rush University Medical Center. He holds a conjoint appointment in the Department of Biomedical Engineering at the University of Illinois at Chicago.

Dr. Wimmer received his diploma in Mechanical Engineering from the Technical University of Munich, Germany. After a post-graduate year in Chicago, Dr. Wimmer continued his education in Germany and earned a doctorate in Biomechanics at the Hamburg University of Technology. Before joining Rush in 2001, he spend four years at the AO Research Institute in Davos, Switzerland. Dr. Wimmer has successfully mentored 12 PhD students and 35 Master students who conducted theses in either the Motion Analysis or Tribology Laboratory.