title: CR TKA UHMWPE wear tested after artificial aging of the vitamin E treated gliding component by simulating daily patient activities.
abstract: The wear behaviour of total knee arthroplasty (TKA) is dominated by two wear mechanisms: the abrasive wear and the delamination of the gliding components, where the second is strongly linked to aging processes and stress concentration in the material. The addition of vitamin E to the bulk material is a potential way to reduce the aging processes. This study evaluates the wear behaviour and delamination susceptibility of the gliding components of a vitamin E blended, ultra-high molecular weight polyethylene (UHMWPE) cruciate retaining (CR) total knee arthroplasty. Daily activities such as level walking, ascending and descending stairs, bending of the knee, and sitting and rising from a chair were simulated with a data set received from an instrumented knee prosthesis. After 5 million test cycles no structural failure of the gliding components was observed. The wear rate was with 5.62 ± 0.53 mg/million cycles falling within the limit of previous reports for established wear test methods.
authors.affiliation: Aesculap AG, Research & Development, Am Aesculap Platz, 78532 Tuttlingen, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Schwiesau
authors.affiliation: Aesculap AG, Research & Development, Am Aesculap Platz, 78532 Tuttlingen, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Fritz
authors.affiliation: Julius Wolff Institut, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
authors.forename: Ines
authors.initials: I
authors.lastname: Kutzner
authors.affiliation: Julius Wolff Institut, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Bergmann
authors.affiliation: Aesculap AG, Research & Development, Am Aesculap Platz, 78532 Tuttlingen, Germany ; Orthopedic Department, Ludwig-Maximilians-University, Campus Großhadern, Marchioninistraße 15, 81377 Munich, Germany.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Grupp
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001672:Biocompatible Materials / Q000737:chemistry*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D007720:Knee Prosthesis; D008422:Materials Testing; D011095:Polyethylenes / Q000737:chemistry*; D011474:Prosthesis Design; D014810:Vitamin E / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D014810:Vitamin E