title: [Risk factors for dislocation of a cementless total hip endoprosthesis--a statistical analysis].
abstract: OBJECTIVE
  This retrospective study aimed at the statistical identification of risk factors for dislocation for a certain cementless hip endoprothesis.
  
  
  METHODS
  At our department 2605 primary total hip arthroplasties were performed between 1987 and 1997. In 40 patients (1.5%) a dislocation occurred. These patients were compared with a control group matched in number.
  
  
  RESULTS
  No difference was found in both groups with respect to age, height, weight, body-mass index, and diagnosis. A tendency was found that more males were involved in the dislocation group. There were more previous operations found in this group (p = 0.005). Also significant was the fact, that patients in the dislocation group more often had epidural anaesthesia (p = 0.02), more often the implantation of the smaller 28-mm head (vs. 32 mm) (p = 0.02), and a higher inclination angle of the acetabular component (p = 0.02). No difference was found in terms of the surgeons experience, the postoperative leg length, femoral offset, medialisation, cranialisation and antetorsion of the acetabular component.
  
  
  CONCLUSIONS
  Dislocation after total hip arthroplasty is a multifactorial complication. With the use of the Alloclassic/Zweymüller total hip endoprothesis, a higher risk for dislocation was found for patients with previous hip surgery, the use of the smaller endoprosthesis head, a high acetabular inclination angle, and in the use of epidural anaesthesia.
authors.affiliation: Universitätsklinik für Orthopädie Wien.
authors.forename: A
authors.initials: A
authors.lastname: Giurea
authors.forename: H
authors.initials: H
authors.lastname: Zehetgruber
authors.forename: P
authors.initials: P
authors.lastname: Funovics
authors.forename: S
authors.initials: S
authors.lastname: Grampp
authors.forename: L
authors.initials: L
authors.lastname: Karamat
authors.forename: F
authors.initials: F
authors.lastname: Gottsauner-Wolf
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements; D019544:Equipment Failure Analysis; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D001843:Bone Cements