title: [Radiologic changes following cement-free implantation of hip prostheses. 5-year follow-up and clinical experience with the cement-free hip prosthesis Autophor-900-S].
abstract: OBJECTIVE
  To evaluate early reliable radiographic signs of loosening in cementless total hip arthroplasty compared to clinical follow-up.
  
  
  METHODS
  Within a time interval of 5 years 89 patients with 101 hips underwent total hip arthroplasty using the Autophor 900 S-prosthesis. Clinical and radiographic follow-up were first performed retrospectively followed by a prospective investigation.
  
  
  RESULTS
  Radiographic evaluation showed prosthesis fixation in 93%. Loosening of the prosthesis was identified in 4 cases of the acetabular component and in 4 cases of the femoral stem. Pain was associated with radiographically detectable loosening of the cementless arthroplastic components in only two cases.
  
  
  CONCLUSIONS
  Within a follow-up period of up to five years, loosening of cementless total hip arthroplasty occurs in about 7%. The most reliable radiographic signs of loosening are complete radiolucent zones wider than 2 mm at the bone-component interface, progressive subsidence, migration, or tilt of the component. Pain and movement disorders are not specific symptoms and do not necessarily indicate a loosening of the prosthesis.
authors.affiliation: Radiologische Universitätsklinik Bonn.
authors.forename: K
authors.initials: K
authors.lastname: Wilhelm
authors.forename: R
authors.initials: R
authors.lastname: Conrad
authors.forename: H
authors.initials: H
authors.lastname: Reich
authors.forename: H
authors.initials: H
authors.lastname: Zieger
authors.forename: H
authors.initials: H
authors.lastname: Schild
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006615:Hip / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D011859:Radiography
chemical_list: D001843:Bone Cements