title: Accuracy study of new computer-assisted orthopedic surgery software.
abstract: OBJECTIVE
  The new computerized system is based on image analysis and designed to aid in orthopedic surgeries by virtual trajectory of the guide wire, intra-operative planning and various measurements. Validation of the accuracy and safety of any computer-aided surgery system is essential before implementing it clinically. We examined the accuracy of guide-wire length and angle measurements and fusion of multiple adjacent images (panoramic view image, PVI(®)) of the new software.
  
  
  METHODS
  This is a 2-part study. Part I: twenty guide wires were drilled to various depths in a synthetic femur model and the results obtained by the software measurements were compared with manual measurements by a caliper and a depth gauge. Part II: a sawbone femur shaft was osteotomized and various inclinations of > 10° to the varus or valgus angles were tested. The manually obtained measurements of angles and lengths were compared to the new computerized system software PVI.
  
  
  RESULTS
  There was a significant positive linear correlation between all groups of the computerized length and the control measurements (r>0.983, p<0.01). There was no significant difference among different distances, angles or positions from the image intensifier. There was a significant positive linear correlation between the angle and length measurement on the PVI and the control measurement (r>0.993, p<0.01).
  
  
  CONCLUSIONS
  The new computerized software has high reliability in performing measurements of length using an aiming, positioning and referring device intra-operatively.
authors.affiliation: Department of Orthopaedic Surgery, Beilinson-Rabin Medical Center, Petach Tikva, Israel.
authors.forename: Eli
authors.initials: E
authors.lastname: Sidon
authors.forename: Ely L
authors.initials: EL
authors.lastname: Steinberg
mesh_terms: D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*