title: Long-Term Results of Total Hip Arthroplasty with 28-Millimeter Cobalt-Chromium Femoral Heads on Highly Cross-Linked Polyethylene in Patients 50 Years and Less.
abstract: Highly cross-linked polyethylene (HXLPE) is the most commonly used bearing surface in total hip arthroplasty (THA) because of its superior wear properties, but long-term results in young patients are limited. We report on the clinical outcome, radiographic wear patterns and survivorship of 72 patients ≤50 years old who had a 28-millimeter cobalt-chromium femoral head on HXLPE acetabular liner. Mean and median true linear wear rates at average ten-year follow-up were 0.0104 and 0.01 mm per year ± 0.07 mm. Mean and median two-dimensional volumetric wear rates were 12.79 mm(3) and 5.834 mm(3) per year ± 26.1mm(3) as determined by Martell analysis. As a result of the minimal wear profile, there was no evidence of radiographic osteolysis and no wear-related revisions.
authors.affiliation: Washington University School of Medicine, Department of Orthopaedic Surgery, St. Louis, Missouri.
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Stambough
authors.affiliation: Washington University School of Medicine, Department of Orthopaedic Surgery, St. Louis, Missouri.
authors.forename: Gail
authors.initials: G
authors.lastname: Pashos
authors.affiliation: Crystal Lake Orthopedics, Crystal Lake, Illinois.
authors.forename: Frank C
authors.initials: FC
authors.lastname: Bohnenkamp
authors.affiliation: Stanford Medicine Outpatient Center, Department of Orthopedic Surgery, Redwood City, California.
authors.forename: William J
authors.initials: WJ
authors.lastname: Maloney
authors.affiliation: Orthopaedic Biomedical Institute, Department of Orthopaedic Surgery and Rehabilitation Medicine, University of Chicago Medicine & Biological Sciences, Chicago, Illinois.
authors.forename: John M
authors.initials: JM
authors.lastname: Martell
authors.affiliation: Washington University School of Medicine, Department of Orthopaedic Surgery, St. Louis, Missouri.
authors.forename: John C
authors.initials: JC
authors.lastname: Clohisy
mesh_terms: D000293:Adolescent; D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002857:Chromium; D003035:Cobalt; D005260:Female; D005270:Femur Head / Q000601:surgery; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011474:Prosthesis Design; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D002857:Chromium; D003035:Cobalt; D020959:Polyethylene
keywords: Martell method; THA survivorship; highly cross-linked polyethylene; linear and volumetric wear