title: Validation of the femoral component placement during hip resurfacing: a comparison between the conventional jig, patient-specific template, and CT-based navigation.
abstract: BACKGROUND
  Appropriate insertion of a femoral guidewire is essential for hip resurfacing. A simulation study was planned using synthetic femoral bone models and the accuracy and precision of femoral guidewire alignment and insertion point were compared between conventional jigs, patient-specific templates, and computed tomography (CT) based navigation techniques.
  
  
  METHODS
  Anteversion, stem-shaft angle, and the three-dimensional insertion point were measured postoperative with CT. Errors between planned and postoperative measurement and precision were evaluated.
  
  
  RESULTS
  There were no statistically significant differences in error for anteversion or insertion point, although the mechanical jig showed greater error in the stem-shaft angle than the others. Patient-specific template and CT-based navigation showed good precision with high intraclass correlation (ICC) (template, 0.908 to 1.000; navigation, 0.929 to 0.995) and small root mean square error (RMSE) (0.954 to 2.969; 1.468 to 3.213). The mechanical jig group performance was inferior to the others.
  
  
  CONCLUSIONS
  Patient-specific templates and CT-based navigation had good accuracy and precision. The mechanical jig technique was inferior to the others.
authors: Center of Arthroplasty, Kyowakai-Hospital, Osaka, Japan. m-kitada@umin.net
authors: Makoto
authors: M
authors: Kitada
authors: Takashi
authors: T
authors: Sakai
authors: Tsuyoshi
authors: T
authors: Murase
authors: Toshihisa
authors: T
authors: Hanada
authors: Nobuo
authors: N
authors: Nakamura
authors: Nobuhiko
authors: N
authors: Sugano
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005269:Femur / Q000601:surgery*; D006801:Humans; D018802:Patient-Centered Care / Q000379:methods*; D015203:Reproducibility of Results; D012371:Robotics / Q000379:methods*; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*