title: A Novel Method for Assessment of Polyethylene Liner Wear in Radiopaque Tantalum Acetabular Cups: Clinical Validation in Patients Enrolled in a Randomized Controlled Trial.
abstract: Conventional radiostereometric analysis (RSA) for wear is not possible in patients with tantalum cups. We propose a novel method for wear analysis in tantalum cups. Wear was assessed by gold standard RSA and the novel method in total hip arthroplasty patients enrolled in a randomized controlled trial receiving either titanium or tantalum cups (n=46). The novel method estimated the center of the head using a model based on identification of two proximal markers on the stem and knowledge of the stem/head configuration. The novel method was able to demonstrate a pattern of wear that was similar to the gold standard in titanium cups. The novel method offered accurate assessment and is a viable solution for assessment of wear in studies with tantalum cups.
authors.affiliation: Harris Orthopaedic Laboratory, Department of Orthopedics, Massachusetts General Hospital, Boston, Massachusetts; Department of Orthopedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.
authors.forename: Anders
authors.initials: A
authors.lastname: Troelsen
authors.affiliation: Harris Orthopaedic Laboratory, Department of Orthopedics, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Meridith E
authors.initials: ME
authors.lastname: Greene
authors.affiliation: Department of Orthopedics, University of Massachusetts Medical School, The Arthritis and Joint Replacement Center, Worchester, Massachusetts.
authors.forename: David C
authors.initials: DC
authors.lastname: Ayers
authors.affiliation: Harris Orthopaedic Laboratory, Department of Orthopedics, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Charles R
authors.initials: CR
authors.lastname: Bragdon
authors.affiliation: Harris Orthopaedic Laboratory, Department of Orthopedics, Massachusetts General Hospital, Boston, Massachusetts.
authors.forename: Henrik
authors.initials: H
authors.lastname: Malchau
mesh_terms: D000077:Acetabulum; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods; D001672:Biocompatible Materials; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D059869:Radiostereometric Analysis; D013635:Tantalum; D014025:Titanium; D016896:Treatment Outcome
chemical_list: D001672:Biocompatible Materials; D013635:Tantalum; D020959:Polyethylene; D014025:Titanium
keywords: conventional polyethylene; highly cross-linked polyethylene; novel method for wear measurement; polyethylene wear; radiostereometric analysis (RSA); total hip replacement