title: Accuracy of corrective osteotomy using a custom-designed device based on a novel computer simulation system.
abstract: BACKGROUND
  We developed an original computer program that three-dimensionally simulates anatomical deformity correction of an extremity based on computed tomography (CT) data and an operative method that uses a custom-designed surgical device to realize the simulation. The purpose of this study was to investigate the feasibility and accuracy of this system using cadaver bones.
  
  
  METHODS
  Twenty dry forearm bones were used to investigate the accuracy of this system. The error in the setting location of the template was evaluated as the difference between the setting location in the computer simulation and the actual setting location. A mock corrective osteotomy using a custom-made template was performed and the results were compared with the preoperative simulation.
  
  
  RESULTS
  All of the templates fitted snugly to the bone surface, and a mock osteotomy was performed as simulated. The errors in the setting location of the template on the bone surface were less than 1.0 mm and 1.0°. The accuracy of the simulation system as evaluated by a mock operation was also less than 1.0 mm and 1.0°.
  
  
  CONCLUSIONS
  The system has sufficient feasibility and accuracy to realize anatomical and precise 3-D deformity correction of an extremity.
authors.affiliation: Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2, Yamada-oka, Suita, Osaka, 565-0871, Japan. oka-kunihiro@umin.ac.jp
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Oka
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Murase
authors.forename: Hisao
authors.initials: H
authors.lastname: Moritomo
authors.forename: Akira
authors.initials: A
authors.lastname: Goto
authors.forename: Ryoji
authors.initials: R
authors.lastname: Nakao
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Sugamoto
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D005542:Forearm / Q000000981:diagnostic imaging / Q000601:surgery*; D006226:Hand Deformities / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D008953:Models, Anatomic; D010027:Osteotomy / Q000295:instrumentation*; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed / Q000379:methods*