title: Comparison of periprosthetic tissue digestion methods for ultra-high molecular weight polyethylene wear debris extraction.
abstract: There is considerable interest in characterization of wear debris from polyethylene (UHMWPE) bearing components used in total joint replacement. To isolate UHMWPE wear debris, tissue samples must be excised from regions adjacent to revised UHMWPE implant components, followed by exposure to one of many available tissue digestion methods. Numerous studies demonstrate successful digestion, but the relative efficiency of each method is not clear. The purpose of this study was to evaluate a variety of conditions for tissue digestion to provide a quantitative comparison of methods. Porcine and human hip tissues were exposed for 24 h to basic, acidic or enzymatic agents, filtered and digestion efficiency calculated based on the percentage of initial to final tissue weight. Of the conditions tested, 5 M NaOH, 5 M KOH, 15 M KOH or 15.8 M HNO(3) yielded the most complete porcine hip tissue digestion (<1% residual tissue weight; p < 0.05). Proteinase K and Liberase Blendzyme 3 did not effectively digest tissue in a 24 h period. Similar to results from the porcine dataset, human tissues digestion was most efficient using 5 M NaOH, 5 M KOH or 15.8 M HNO(3) (<1% residual tissue weight; p < 0.05). To verify that particle surface modifications did not occur after prolonged reagent exposure, GUR415 and Ceridust 3715 particles were immersed in each solution for 24 h. Overall, this study provides a framework for thorough and efficient digestive methods for UHMWPE wear debris extraction.
authors.affiliation: Department of Biomedical Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Baxter
authors.forename: Marla J
authors.initials: MJ
authors.lastname: Steinbeck
authors.forename: Joanne L
authors.initials: JL
authors.lastname: Tipper
authors.forename: Javad
authors.initials: J
authors.lastname: Parvizi
authors.forename: Michele
authors.initials: M
authors.lastname: Marcolongo
authors.forename: Steve M
authors.initials: SM
authors.lastname: Kurtz
mesh_terms: D000077:Acetabulum / Q000737:chemistry / Q000378:metabolism; D000818:Animals; D002424:Caustics / Q000737:chemistry; D006622:Hip Prosthesis; D006801:Humans; D006878:Hydroxides / Q000737:chemistry; D007202:Indicators and Reagents / Q000737:chemistry; D008422:Materials Testing; D017942:Nitric Acid / Q000737:chemistry; D011095:Polyethylenes / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry; D011475:Prosthesis Failure; D012972:Sodium Hydroxide / Q000737:chemistry; D013552:Swine
chemical_list: D002424:Caustics; D006878:Hydroxides; D007202:Indicators and Reagents; D011095:Polyethylenes; D017680:Potassium Compounds; C111601:ultra-high molecular weight polyethylene; D017942:Nitric Acid; D012972:Sodium Hydroxide; C029943:potassium hydroxide