title: Patients with bilateral procedures can be included in total hip arthroplasty research without biasing results.
abstract: We explored the influence of bilaterality on the results of a trial of cemented vs uncemented acetabular components. Harris hip scores after 6 months, 2 years, 5 years, and 10 years were analyzed in 240 arthroplasties in 215 patients. Thus, 190 cases in 190 patients were compared to 50 cases in 25 patients. The group of 190 patients were further split into a group of 90 patients who had contralateral hip impairment, knee or spine problems, or significant comorbidities and into a group of 100 patients who had unilateral hip arthropathy. There was no significant difference between the cemented and uncemented groups or between any of these groups and the total group on Harris hip score, indicating that the inclusion of bilateral cases did not alter the outcome.
authors.affiliation: Department of Orthopedic Surgery, Ostfold Hospital Trust, 1603 Fredrikstad, Norway.
authors.forename: Kristian
authors.initials: K
authors.lastname: Bjorgul
authors.forename: Wendy M
authors.initials: WM
authors.lastname: Novicoff
authors.forename: Knut
authors.initials: K
authors.lastname: Brevig
authors.forename: Ola
authors.initials: O
authors.lastname: Ahlund
authors.forename: Mogens
authors.initials: M
authors.lastname: Wiig
authors.forename: Khaled J
authors.initials: KJ
authors.lastname: Saleh
mesh_terms: D000077:Acetabulum / Q000601:surgery; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D018401:Sample Size; D015983:Selection Bias; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements