title: Mid-term results and migration behaviour of a ti-alloy cemented stem.
abstract: Between 1991 and 1994, 147 patients (154 hips) underwent a primary cemented total hip replacement using the Ultima ti-alloy, collarless, double-tapered stem and a UHMWPE cup. The average age at operation was 66.4 years. Ninety-one patients (97 hips) were available for review with an average follow-up of 76 months. The Harris hip score had improved from pre-operative average of 43.1 (12.5-65.0) to the latest score of 88.9 (67.5-100). There were 11 revisions in total, eight of which were for aseptic stem loosening. The results of Kaplan-Meier survival analysis, based on stem revision for aseptic loosening as an end-point, was 92% at 8 years. Early stem migration analysis at 2 years was possible in 114 cases using digitised radiographs analysed by the EBRA method. Sixty-three stems had not migrated and 35 migrated less than 2 mm with only one of these ending in failure. Sixteen stems showed early migration of more than 2 mm and five of these failed. Early stem migration is predictive of stem failure. Osteolytic lesions occurred in 12 femurs and four of these stems failed.
authors.affiliation: Department of Orthopaedic Surgery, University of Glasgow, Western Infirmary, Glasgow 11 6NT, UK.
authors.forename: R M Dominic
authors.initials: RM
authors.lastname: Meek
authors.forename: John
authors.initials: J
authors.lastname: Michos
authors.forename: Peter
authors.initials: P
authors.lastname: Grigoris
authors.forename: David L
authors.initials: DL
authors.lastname: Hamblen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001672:Biocompatible Materials; D001843:Bone Cements; D002484:Cementation / Q000379:methods; D005260:Female; D005269:Femur / Q000601:surgery; D005548:Foreign-Body Migration / Q000209:etiology*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D011446:Prospective Studies; D011475:Prosthesis Failure; D012086:Reoperation; D014025:Titanium; D016896:Treatment Outcome
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D001843:Bone Cements; D014025:Titanium