title: Effect of Polyethylene Crosslinking and Bearing Design on Wear of Unicompartmental Arthroplasty.
abstract: Wear and polyethylene damage continue to be important factors affecting outcomes of unicompartmental knee arthroplasty. We compared two design rationales for unicompartmental arthroplasty: fully congruent mobile bearings; or moderately conforming fixed bearings using experimental and computational wear simulation. Experimental wear rates were 3.89 (±0.12) mg/million cycles for the highly crosslinked Triathlon PKR fixed bearing compared to 18.35 (±0.19) mg/million cycles for the low crosslinked Oxford mobile bearing. Finite element analysis was used to calculate the effect of crosslinking and backside wear. Increase in polyethylene crosslinking reduced wear by 68% while backside wear comprised 46% of the total wear in the mobile bearing. Increasing conformity may not be the sole predictor of wear performance and highly crosslinked fixed-bearing polyethylene insert can also provide high wear performance.
authors: Shiley Center for Orthopaedic Research and Education at Scripps Clinic, Scripps Health, La Jolla, California.
authors: Jonathan
authors: J
authors: Netter
authors: Shiley Center for Orthopaedic Research and Education at Scripps Clinic, Scripps Health, La Jolla, California.
authors: Juan C
authors: JC
authors: Hermida
authors: Stryker Orthopaedics, Mahwah, New Jersey.
authors: Jerry
authors: J
authors: D'Alessio
authors: Stryker Orthopaedics, Mahwah, New Jersey.
authors: Mark
authors: M
authors: Kester
authors: Shiley Center for Orthopaedic Research and Education at Scripps Clinic, Scripps Health, La Jolla, California.
authors: Darryl D
authors: DD
authors: D'Lima
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D001672:Biocompatible Materials / Q000737:chemistry*; D003198:Computer Simulation; D020342:Finite Element Analysis; D006801:Humans; D007720:Knee Prosthesis; D020959:Polyethylene / Q000737:chemistry*; D011474:Prosthesis Design; D011475:Prosthesis Failure
chemical_list: D001672:Biocompatible Materials; D020959:Polyethylene
keywords: crosslinked polyethylene; finite element analysis; mobile bearing; partial knee replacement; polyethylene wear; wear simulation