title: Feasibility of a navigated registration technique in FAI surgery.
abstract: BACKGROUND
  Arthroscopic femoral osteoplasties might be technically demanding, might cause prolonged operative times and restrict the intraoperative overview. An automated navigated matching process of preoperative CT-data and intraoperative fluoroscopy should allow for noninvasive registration for FAI-surgery.
  
  
  METHODS
  Six hip joints were used with a conventional navigation system. Defined osseous lesion (2 × 2 mm) in the femoral neck, head neck junction, and head region were created followed by automated segmentation including CT-fluoro image fusion by the navigation system. Precision of registration process was tested trough a lateral arthroscopic portal. In vivo distances between pointer tip to bone were measured. Secondary in vivo distances between an inserted navigated shaver and the osseous lesions were measured.
  
  
  RESULTS
  Our results allow a CT-fluoroscopy matching procedure for noninvasive registration process for navigated FAI-surgery in multiplanar planes. Precision is more accurate at the femoral neck and head-neck junction than at the femoral head area.
  
  
  CONCLUSIONS
  Future navigated applications might simplify and increase precision of FAI-surgery.
authors.affiliation: Department of Orthopaedic Surgery, ENDO-Klinik Hamburg GmbH, Germany. Daniel.Kendoff@endo.de
authors.forename: Daniel
authors.initials: D
authors.lastname: Kendoff
authors.forename: Mustafa
authors.initials: M
authors.lastname: Citak
authors.forename: Volker
authors.initials: V
authors.lastname: Stueber
authors.forename: Leah
authors.initials: L
authors.lastname: Nelson
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Pearle
authors.forename: Friedrich
authors.initials: F
authors.lastname: Boettner
mesh_terms: D001182:Arthroscopy; D002102:Cadaver; D005240:Feasibility Studies; D057925:Femoracetabular Impingement / Q000175:diagnosis* / Q000601:surgery*; D005471:Fluoroscopy; D006801:Humans; D019637:Orthopedic Procedures / Q000379:methods; D014057:Tomography, X-Ray Computed