title: [Radiological changes after implantation of 2 different cementless hip prostheses].
abstract: OBJECTIVE
  Of the study was to evaluate radiological alterations of the femoral bone after implantation of two different prostheses.
  
  
  METHODS
  81 patients with 87 hips underwent total hip arthroplasty by using the Zweymüller-stem fixating in the medullary canal, and 175 patients with 182 ABG-stems with a proximally fixating, anatomical design were followed up clinically and radiologically.
  
  
  RESULTS
  Adaptive bone remodelling in Zweymüller-stems showed in some patients thickening of the cortex of the femur and proximal bone-stock loss; reactive lines were seen in the proximal areas surrounding the prosthesis. Radiographs of patients with ABG-stems showed these lines in the distal, smooth part of the prosthesis and cancellous densification occurred in the area of load transfer distal to the trochanteric region.
  
  
  CONCLUSIONS
  Typical x-ray findings due to various stem designs were identified and can be transferred to other cementless prostheses and should be considered if there is a suspicion of aseptic loosening.
authors.affiliation: Klinik für Orthopädie, Johannes Gutenberg-Universität, Mainz.
authors.forename: A
authors.initials: A
authors.lastname: Eckardt
authors.forename: A
authors.initials: A
authors.lastname: Karbowski
authors.forename: M
authors.initials: M
authors.lastname: Schwitalle
authors.forename: B
authors.initials: B
authors.lastname: Herbsthofer
authors.forename: K F
authors.initials: KF
authors.lastname: Kreitner
mesh_terms: D001696:Biomechanical Phenomena; D016723:Bone Remodeling; D005069:Evaluation Studies as Topic; D005269:Femur / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography