title: Good short-term outcome of primary total hip arthroplasty with cementless bioactive glass ceramic bottom-coated implants: 109 hips followed for 3–9 years.
abstract: OBJECTIVE
  Cementless total hip arthroplasty is currently favored by many orthopedic surgeons. The design of the porous surface is critically important for long-term fixation. We examined the clinical and radiographic outcome of the cementless titanium hip implant with a bottom coating of apatite-wollastonite containing bioactive glass ceramic.
  
  
  METHODS
  We retrospectively reviewed 109 hips (92 patients) that had undergone primary cementless total hip arthroplasty with bioactive glass ceramic bottom-coated implants. The mean follow-up period was 7 (3-9) years. Hip joint function was evaluated with the Merle d'Aubigné and Postel hip score, and radiographic changes were determined from anteroposterior radiographs.
  
  
  RESULTS
  The mean hip score improved from 9.7 preoperatively to 17 at the final follow-up. The overall survival rate was 100% at 9 years, when radiographic loosening or revision for any reason was used as the endpoint. 3 stems in 2 patients subsided more than 3 mm vertically within 1 year after implantation. Radiographs of the interface of the stem and femur were all classified as bone ingrowth fixation.
  
  
  CONCLUSIONS
  The short-term results of this study show good outcome for cementless implants with a bottom coating of apatite-wollastonite containing bioactive glass ceramic.
authors.affiliation: Department of Orthopaedics, Kyoto University, Kyoto, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: So
authors.forename: Kumiko T
authors.initials: KT
authors.lastname: Kanatani
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Kuroda
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Akiyama
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods*; D001843:Bone Cements; D002516:Ceramics; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D007564:Japan; D053208:Kaplan-Meier Estimate; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012189:Retrospective Studies; D018570:Risk Assessment; D012737:Sex Factors; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D001843:Bone Cements; C023506:Glass ceramics