title: Prospective long-term follow-up of the cementless bicontact hip stem with plasmapore coating.
abstract: OBJECTIVE
  A prospective long-term study of the first 250 cementless Bicontact stems implanted in the BG Trauma Centre, Tuebingen, Germany.
  
  
  METHODS
  All of the patients in this series (treatment period June 1987 to April 1990) who were still contactable were invited for clinical and radiological follow-up. The radiographs were analysed for signs of loosening in the form of Gruen lysis zones, stress shielding, subsidence behaviour, heterotopic ossification and spot welds.
  
  
  RESULTS
  The average follow-up period was 17.8 (16.7 - 19.5) years. The overall rate of follow-up was 65 % (162 of 250) and 91 % of patients who were still alive (162 of 179). The average patient age was 56.2 years at the time of operation and 74.0 years at follow-up. The average HHS was 81.6 points. In the course of the first 10 years (up to 03/1998), a total of 8 stem revisions had to be performed. In the period from 03/1998 to 01/2007, 2 cases of loosening requiring revision occurred in the patients still alive at the time of follow-up. The survival rate calculated was thus 95.6 %.
  
  
  CONCLUSIONS
  These outstanding results provide enduring support for the philosophy of the cementless and bone-preserving fixation principles underlying the Bicontact hip stem with proximal intertrochanteric transmission of forces and high primary rotational stability.
authors.affiliation: BG Trauma Centre, University of Tuebingen, Schnarrenbergstrasse 95, Tuebingen, Germany. uochs@bgu-tuebingen.de
authors.forename: U
authors.initials: U
authors.lastname: Ochs
authors.forename: C
authors.initials: C
authors.lastname: Eingartner
authors.forename: R
authors.initials: R
authors.lastname: Volkmann
authors.forename: B G
authors.initials: BG
authors.lastname: Ochs
authors.forename: C
authors.initials: C
authors.lastname: Huber
authors.forename: S
authors.initials: S
authors.lastname: Weller
authors.forename: K
authors.initials: K
authors.lastname: Weise
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016025:Bone Transplantation; D002484:Cementation; D020099:Coated Materials, Biocompatible; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery; D005271:Femur Head Necrosis / Q000601:surgery; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging / Q000601:surgery; D015207:Osteoarthritis, Hip / Q000601:surgery; D010147:Pain Measurement; D016062:Porosity; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000601:surgery; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D013530:Surgical Wound Infection / Q000000981:diagnostic imaging / Q000601:surgery; D016019:Survival Analysis; D014025:Titanium
chemical_list: D020099:Coated Materials, Biocompatible; D014025:Titanium