title: Clinical and radiological outcome of the cemented Contemporary acetabular component in patients < 50 years of age.
abstract: Despite the worldwide usage of the cemented Contemporary acetabular component (Stryker), no published data are available regarding its use in patients aged < 50 years. We undertook a mid- to long-term follow-up study, including all consecutive patients aged < 50 years who underwent a primary total hip replacement using the Contemporary acetabular component with the Exeter cemented stem between January 1999 and January 2006. There were 152 hips in 126 patients, 61 men and 65 women, mean age at surgery 37.6 years (16 to 49 yrs). One patient was lost to follow-up. Mean clinical follow-up of all implants was 7.6 years (0.9 to 12.0). All clinical questionnaire scores, including Harris hip score, Oxford hip score and several visual analogue scales, were found to have improved. The eight year survivorship of all acetabular components for the endpoints revision for any reason or revision for aseptic loosening was 94.4% (95% confidence interval (CI) 89.2 to 97.2) and 96.4% (95% CI 91.6 to 98.5), respectively. Radiological follow-up was complete for 146 implants. The eight year survival for the endpoint radiological loosening was 93.1% (95% CI 86.2 to 96.6). Three surviving implants were considered radiologically loose but were asymptomatic. The presence of acetabular osteolysis (n = 17, 11.8%) and radiolucent lines (n = 20, 13.9%) in the 144 surviving cups indicates a need for continued observation in the second decade of follow-up in order to observe their influence on long-term survival. The clinical and radiological data resulting in a ten-year survival rate > 90% in young patients support the use of the Contemporary acetabular component in this specific patient group.
authors.affiliation: Radboud University Medical Centre, Department of Orthopaedics, 357, P. O. Box 9101, 6500 HB Nijmegen, the Netherlands.
authors.forename: M W J L
authors.initials: MW
authors.lastname: Schmitz
authors.forename: C
authors.initials: C
authors.lastname: Timmer
authors.forename: W H C
authors.initials: WH
authors.lastname: Rijnen
authors.forename: J W M
authors.initials: JW
authors.lastname: Gardeniers
authors.forename: B W
authors.initials: BW
authors.lastname: Schreurs
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D001843:Bone Cements; D002484:Cementation / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure / Q000209:etiology; D011859:Radiography; D012086:Reoperation / Q000706:statistics & numerical data; D012720:Severity of Illness Index; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D001843:Bone Cements
keywords: Arthroplasty; Cemented; Contemporary acetabular component; Primary outcome; THR; Total hip replacement