title: Hydroxyapatite-coated total knee arthroplasty in rheumatoid arthritis patients: a short-term follow-up study.
abstract: OBJECTIVE
  To determine the outcome of cementless hydroxyapatite-coated total knee prosthesis in rheumatoid patients.
  
  
  METHODS
  Analytical.
  
  
  METHODS
  University of Yamanashi Hospital, Japan, from October 1999 to September 2002.
  
  
  METHODS
  Twenty total knee arthroplasties using HA-coated Scorpio Superflex CR and Delta 7000 series were performed in 17 rheumatoid patients. Pre and postoperative results were compared using JOA scores.
  
  
  RESULTS
  Male: female ratio was 16:1, average age was 67 years and mean duration of follow-up was two years. JOA scores improved significantly (p<0.05) postoperatively from an average of 37 to 80. Varus and valgus angular deformities improved significantly and 90% of the knees had alignment between zero and 5 degrees of valgus angulation with an average tibiofemoral angle (FTA) of 172. The radiographic findings revealed no radiolucent lines at two years follow-up. Distal femur osteolysis was not observed.
  
  
  CONCLUSIONS
  The clinical results were excellent at 2-year follow-up, which are in agreement with other reports using hydroxyapatite-coated knee prosthesis.
authors.affiliation: Department of Orthopaedic Surgery, Foundation University Medical College, Rawalpindi, Pakistan. najami69@hotmail.com
authors.forename: Najam
authors.initials: N
authors.lastname: Siddiqi
authors.forename: Hajime
authors.initials: H
authors.lastname: Sugiyama
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Horiuchi
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Hamada
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D001175:Arthrography; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D020099:Coated Materials, Biocompatible; D017886:Durapatite; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D020099:Coated Materials, Biocompatible; D017886:Durapatite