title: [Intermediate outcomes of alumina-on-alumina bearing total hip arthroplasty].
abstract: OBJECTIVE
  To explore the intermediate outcomes of third-generation alumina-on-alumina total hip arthroplasty (THA).
  
  
  METHODS
  A consecutive series of 165 primary alumina-on-alumina total hip arthroplasties were performed in 135 patients. Three patients died and 13 patients lost follow-up so that a total of 119 patients (146 hips) were available for study. The mean patient age was 53.4 ± 11.0 years old (range: 26 - 79). Hydroxyapatite. (HA)-coated press-fit acetabular cups were used in all cases. At femoral side, 123 cases were implanted with HA-coated uncemented stems and 23 cases implanted with high polished double taped cemented stems. All patients were evaluated clinically and radiographically after a minimal follow-up duration of 60 months.
  
  
  RESULTS
  The preoperative mean Harris hip score of 49.6 ± 7.9 points improved to 91.7 ± 3.0 points at the last follow-up (P < 0.05). The 5-year survival for any reason lead to revision was 96.6%. Five hips were under revision, 1 for acetabular shell loosening and migration, 1 for Vancouver B2 periprosthetic fracture, 1 for fracture of pure alumina liner and 2 for infections. All other prostheses demonstrated no radiographic evidence of loosening. No periprosthetic osteolysis was found. There were 2 cases of dislocations and 2 patients presented postoperatively with "squeaking-like" hips.
  
  
  CONCLUSIONS
  The clinical and radiographic outcomes after primary THA with third-generation ceramic-on-ceramic bearing surfaces are favorable after a minimal follow-up duration of 5 years. The modified alumina-on-alumina bearing implants offer a better option for younger and active patients.
authors.affiliation: Department of Orthopedic Surgery, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China.
authors.forename: Hao-bo
authors.initials: HB
authors.lastname: Wu
authors.forename: You-zhi
authors.initials: YZ
authors.lastname: Cai
authors.forename: Shi-gui
authors.initials: SG
authors.lastname: Yan
authors.forename: Xiang-hua
authors.initials: XH
authors.lastname: Wang
authors.forename: Li-dong
authors.initials: LD
authors.lastname: Wu
authors.forename: Rong-xin
authors.initials: RX
authors.lastname: He
authors.forename: Xue-song
authors.initials: XS
authors.lastname: Dai
mesh_terms: D000328:Adult; D000368:Aged; D000537:Aluminum Oxide; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002516:Ceramics; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D016896:Treatment Outcome
chemical_list: D000537:Aluminum Oxide