Semi-quantitative assessment methods for backside polyethylene damage in modular total knee replacements |
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| Affiliation: | 1. Concordia Hip & Knee Institute, Suite 310 - 1155 Concordia Ave., Winnipeg, MB, Canada R2K 2M9;2. Division of Orthopaedic Surgery, London Health Sciences Centre, University of Western Ontario, 339 Windermere Rd. London, ON, Canada N6A 5A5;3. Department of Statistics and Actuarial Science, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1;4. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1;1. Department of Orthopaedic Surgery, David Geffen School of Medicine at UCLA 76-143 CHS, 10833 Le Conte Ave, Los Angeles, CA, 90095, United States;2. University Foot & Ankle Institute, 1245 Wilshire Blvd Ste 306, Los Angeles, CA, 90017, United States;1. Clinic for Foot and Ankle Surgery, Hessing Foundation, Hessingstr. 17, 86199 Augsburg, Germany;2. Laboratory for Biomechanics and Biomaterials, Department of Orthopaedics, Hannover Medical School, Anna-von-Borries-Str. 1-7, 30625 Hannover, Germany;3. Institute of Forming technology and Machines, Leibniz University Hannover, An der Universität 2, 30823 Garbsen, Germany;4. Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany;1. Centre Hospitalier Universitaire de Lyon, Service de Chirurgie Orthopédique et Traumatologique, Centre Hospitalier Lyon-Sud, FR69495 Pierre-Bénite, Rhône-Alpes, France;2. Clinique Mutualiste Chirurgicale, 42000 Saint-Etienne, Rhône-Alpes, France;3. Université Lyon 1, IFSTTAR, LBMC UMR-T 9406, Laboratoire de Biomécanique et Mécanique des chocs, 69975 Bron, Rhône-Alpes, France;4. CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Évolutive, Équipe Biostatistique-Santé, F-69100 Villeurbanne, France;5. Hospices Civils de Lyon, Pôle Santé Publique, Service de Biostatistique et Bioinformatique, F-69003 Lyon, France;6. Université Lyon 1, F-69100 Villeurbanne, France;7. Université de Lyon, F-69000 Lyon, France;1. Department of Exercise Science, Arnold School of Public Health, University of South Carolina, United States;2. Department of Epidemiology and Biostatistics, University of South Carolina, United States;3. Office of Energetics, Nutrition Obesity Research Center, University of Alabama, United States;1. Discipline of Medical Specialties, University of Adelaide, Adelaide, South Australia, Australia;2. Department of Orthopaedics, Assuta Medical Centre, Ashdod, Israel;3. Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada |
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| Abstract: | Two semi-quantitative grading methods (referred to as the Hood/Wasielewski-method and the Modified-method) were described and then applied to 52 retrieved tibial polyethylene inserts from modular total knee replacements. Their ability to assess backside surface damage was compared. The damage score correlation with the implantation period greater than 24 months was better using the Modified-method (R=0.524, p=0.006) than using the Hood/Wasielewski-method (R=0.328, p=0.102). Also, the Modified-method gave significantly higher damage scores for males with gamma-in-air irradiated polyethylene inserts whereas the Hood/Wasielewski-method did not. Thus, the damage score obtained using the Modified-method seemed to provide a better representation of clinical surface damage and possibly PE wear. |
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