title: Revision arthroplasty with an isoelastic uncemented femoral stem.
abstract: We carried out 102 hip revision arthroplasties using an uncemented isoelastic femoral stem on 92 patients between 1985 and 1989. The proximal femoral bone stock had deteriorated in 45%. Eleven patients died during the mean follow up of 5.7 years. The femoral component has been revised again for loosening in 13, for infection in 5 and for dislocation in 3. Radiographs of 70 hips showed incipient migration at 3 months in 20, and at the time of review 27 hips had migrated 5 mm or more. Nine stems had migrated more than 8 mm and were judged to be loose. There were 11 fractures before operation and 15 during operation; they all healed. Slight cortical hypertrophy of not more than 2 mm was present in most cases. Three patients (4 hips) were excluded because of severe systemic illness. Of the remaining 66 hips, the clinical outcome was excellent in 18%, good in 50%, fair in 26% and poor in 6%. The isoelastic stem is associated with poor primary fixation which is indicated by early subsidence. The results, with a total failure rate of 33%, are unsatisfactory and the isoelastic femoral stem used in this series cannot be recommended for revision operations.
authors.affiliation: Department of Surgery, Oulu University Hospital, Finland.
authors.forename: T J
authors.initials: TJ
authors.lastname: Niinimäki
authors.forename: J P
authors.initials: JP
authors.lastname: Puranen
authors.forename: P K
authors.initials: PK
authors.lastname: Jalovaara
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements; D016723:Bone Remodeling; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D017211:Treatment Failure
chemical_list: D001843:Bone Cements