title: A critical assessment of proximal macrotexturing on cemented femoral components.
abstract: We analyzed the cement-metal interface of 3 different types of femoral components that had proximal macrotexturing after in vitro insertion and after fatigue testing designed to produce debonding and micromotion. These components were compared with clinical retrieval specimens. The cement did not flow into the macrotexturing; rather, hollow, brittle volcanoes or calderas were formed. These fragile protrusions of cement become worn down or abraded by debonded components. This abrasion of cement may contribute to the early and aggressive osteolysis seen in some of these early failures with proximal macrotextured components. The formation of these volcanos and calderas can be aborted by placing bone-cement onto the macrotexturing before stem insertion. This simple technique allows the macrotexturing to be filled with cement.
authors.affiliation: Department of Orthopaedics, Mayo Clinic, Jacksonville, Florida 32224, USA. duffy.gavan@mayo.edu
authors.forename: G P
authors.initials: GP
authors.lastname: Duffy
authors.forename: O K
authors.initials: OK
authors.lastname: Muratoglu
authors.forename: S A
authors.initials: SA
authors.lastname: Biggs
authors.forename: S L
authors.initials: SL
authors.lastname: Larson
authors.forename: A J
authors.initials: AJ
authors.lastname: Lozynsky
authors.forename: W H
authors.initials: WH
authors.lastname: Harris
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001843:Bone Cements; D005260:Female; D005269:Femur / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008670:Metals; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D013499:Surface Properties
chemical_list: D001843:Bone Cements; D008670:Metals