title: Five-year results of the uncemented RM pressfit cup clinical evaluation and migration measurements by EBRA.
abstract: This was a prospective consecutive, study of 50 patients (mean age 72 years, 56% males) treated unilaterally for primary osteoarthrosis using the uncemented, isoelastic, monoblock RM Pressfit Cup. Migration and wear were assessed using the EBRA (Ein-Bild-Röntgen-Analyse) software (201 radiographs from 36 patients). Mean migration was 0.82 mm after 2 years and 1.25 mm after 5 years. A decreasing migration rate over the period was observed. The mean annual wear rate was 0.09 mm/y. Five years after surgery, 84% of patients reached good or excellent Harris hip score values. No revisions related to the acetabular component were necessary. All cups appeared to have high primary stability.
authors.affiliation: Department of Orthopaedic Surgery, Sonnenhof, Berne, Switzerland.
authors.forename: Tobias
authors.initials: T
authors.lastname: Wyss
authors.forename: Peter
authors.initials: P
authors.lastname: Kägi
authors.forename: Peter
authors.initials: P
authors.lastname: Mayrhofer
authors.forename: Hubert
authors.initials: H
authors.lastname: Nötzli
authors.forename: Dominik
authors.initials: D
authors.lastname: Pfluger
authors.forename: Karl
authors.initials: K
authors.lastname: Knahr
mesh_terms: D000368:Aged; D000465:Algorithms; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D015994:Incidence; D007593:Joint Instability / Q000453:epidemiology; D008137:Longitudinal Studies; D008297:Male; D015207:Osteoarthritis, Hip / Q000601:surgery; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies; D012984:Software; D016896:Treatment Outcome
keywords: EBRA; RM Pressfit Cup; migration; total hip arthroplasty