title: [Radiological mid-term results of total knee arthroplasty with femoral components of different materials].
abstract: OBJECTIVE
  The present work aimed at evaluating the radiological mid-term results of femoral components of different materials in an identically designed total knee system.
  
  
  METHODS
  31 knees with zirconium femoral components and 32 standard femoral components were evaluated about 4 years following surgery using the Roentgenographic Evaluation and Scoring System of the Knee Society.
  
  
  RESULTS
  In both groups, the implant position was correct. There was a statistically significant higher rate of radiolucent lines in zones 1 and 4 at the tibia site in the zirconium group.
  
  
  CONCLUSIONS
  Our clinical results disagree with the results of biomechanical studies of the same type of prosthesis. However, there are some findings from animal studies showing that zirconium ions may inhibit the mineralisation of osteoid, which could be an explanation for the higher rate of radiolucent lines seen in the present study.
authors.affiliation: Zentrum für Erkrankungen und Verletzungen der Haltungs- und Bewegungsorgane, Martin-Luther-Universität Halle-Wittenberg, Halle. felix.goebel@medizin.uni-halle.de
authors.forename: F
authors.initials: F
authors.lastname: Göbel
authors.forename: S
authors.initials: S
authors.lastname: Ulbricht
authors.forename: W
authors.initials: W
authors.lastname: Hein
authors.forename: A
authors.initials: A
authors.lastname: Bernstein
mesh_terms: D000328:Adult; D000368:Aged; D002516:Ceramics; D019544:Equipment Failure Analysis; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D009556:Niobium; D016348:Osseointegration / Q000502:physiology; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D011474:Prosthesis Design; D011859:Radiography; D014800:Vitallium; D015040:Zirconium
chemical_list: D009556:Niobium; D014800:Vitallium; D015040:Zirconium; C028541:zirconium oxide