title: Failed cementless total hip arthroplasty for osteoarthrosis due to hip dysplasia. A minimum five-year follow-up study.
abstract: We performed cementless total hip arthroplasty on patients with secondary osteoarthrosis due to hip dysplasia. We conducted prospective radiographic and clinical studies on 75 hips with a minimum five-year follow-up. Aseptic loosening of the Dual geometry Microstructured cup used on the acetabular component was recognized in 2 of 75 hips within five years postoperatively, but neither case required revision. As for the femoral component, within five years of operation, in 9 of 28 (32%) and 11 of 31 (35%) patients, aseptic loosening was recognized in the Omnifit Normalized Smooth surfaced stem (FIT-N) and the Omniflex Normalized Smooth surfaced stem (FLEX-N), respectively, neither of which have a porous coating on their proximal end. Revisions of the stems have been conducted on three FIT-N and two FLEX-N stems. Aseptic loosening was recognized in 2 of 16 Omnifit Microstructured stems (FIT-M) with porous coating, but revisions have not yet been required in these cases. We conclude that stems without a porous surface coating should not be used for cementless total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Nagoya University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kawamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: T
authors.initials: T
authors.lastname: Iwase
authors.forename: S
authors.initials: S
authors.lastname: Iwasada
authors.forename: T
authors.initials: T
authors.lastname: Kanamono
authors.forename: H
authors.initials: H
authors.lastname: Iwata
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D020099:Coated Materials, Biocompatible / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D006617:Hip Dislocation / Q000150:complications*; D006622:Hip Prosthesis / Q000009:adverse effects* / Q000145:classification; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D020099:Coated Materials, Biocompatible