title: Three metal-on-metal hip replacement devices from the same manufacturer--a short- to mid-term survival.
abstract: The aim of this retrospective study was to evaluate short- to mid-term results of three different metal-on-metal hip devices from the same manufacturer. A total of 329 hip operations were performed in a single academic unit between 2004 and 2010 using either Birmingham hip resurfacing or Synergy--Birmingham and Synergy--R3 total hip arthroplasty. The overall survival rate at the end of the follow-up time for Birmingham hip resurfacing was 88%, for Synergy--Birmingham total hip arthroplasty 95%, and for Synergy--R3 total hip arthroplasty 81% (p = 0.036). Five revision operations were performed due to adverse reaction to metal debris. Head sizes > 50 mm had lower revision rates compared to smaller ones. Synergy--R3 had a poor survival already at short-term. The mid-term survival of Birmingham hip resurfacing arthroplasty was inferior compared to previous studies.
authors.forename: Inari
authors.initials: I
authors.lastname: Kostensalo
authors.forename: Mika
authors.initials: M
authors.lastname: Junnila
authors.forename: Jari
authors.initials: J
authors.lastname: Mokka
authors.forename: Petri
authors.initials: P
authors.lastname: Virolainen
authors.forename: Tero
authors.initials: T
authors.lastname: Vahlberg
authors.forename: Keijo T
authors.initials: KT
authors.lastname: Mäkelä
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D061825:Metal-on-Metal Joint Prostheses; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012189:Retrospective Studies; D013997:Time Factors