title: Radiographic measurement of wear in 5 cohorts of patients observed for 5 to 22 years.
abstract: Standardized wear measurements using a tablet digitizer were made on long-term serial radiographs for 5 cohorts of total hip replacements to determine any differences in acetabular component polyethylene wear rates. The 5 groups included 4 cemented acetabular component series and 1 cementless acetabular component series. Comparing the rates of linear wear for the 5 groups, 22-mm-head components had similar wear when compared with the 28-mm-head components, both cemented and uncemented, and volumetric wear rates were greater for the cemented 28-mm-head components than for the 22-mm-head components. Although molded 22-mm-head components had less wear than the machined 22-mm-head components, there was no statistically significant difference between the 2. The uncemented metal-backed component with 28-mm-head articulation showed no accelerated wear when compared with the cemented metal-backed components at a shorter 5-year followup. The constant variable in all series was a cemented femoral component.
authors.affiliation: Department of Orthopaedics, University of Iowa, Iowa City 52242, USA.
authors.forename: J J
authors.initials: JJ
authors.lastname: Callaghan
authors.forename: D R
authors.initials: DR
authors.lastname: Pedersen
authors.forename: J P
authors.initials: JP
authors.lastname: Olejniczak
authors.forename: D D
authors.initials: DD
authors.lastname: Goetz
authors.forename: R C
authors.initials: RC
authors.lastname: Johnston
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005547:Foreign Bodies; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D010014:Osteolysis; D011095:Polyethylenes; D011475:Prosthesis Failure; D011859:Radiography
chemical_list: D011095:Polyethylenes