title: OrthoPilot cup navigation--how to optimise cup positioning?
abstract: The kinematic cup navigation procedure is a surgically simple technique for improving the precision of cup placement. Without CT scans, a reduction of cup malpositions is possible. The rate of desired cup inclination and anteversion angles is markedly increased as shown by the first results of 147 navigated cups. While the inclination is reached precisely with a tendency to a slightly larger angle than desired, the postoperative anteversion angle shows a somewhat bigger variation than the intraoperatively navigated angle with a tendency to less anteversion. This might be due to a lack of information about the real pelvis position during X-ray control.
  
  
  CONCLUSIONS
  dislocations of the prostheses might be reduced significantly. The kinematic cup navigation with the use of the OrthoPilot is an additional and useful tool for the surgeon. The procedure is simple, quick, and cost effective, does not cause specific complications, and does not require additional CT or MRI scans. Further improvement can be expected by additional hip stem navigation techniques in the near future.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Lukas Hospital, Hindenburgstrasse 56, 32257 Buende, Germany. h.kiefer@lukas-krankenhaus.de
authors.forename: Hartmuth
authors.initials: H
authors.lastname: Kiefer
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D025321:Surgery, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome