title: Novel 3D hexapod computer-assisted orthopaedic surgery system for closed diaphyseal fracture reduction.
abstract: BACKGROUND
  Long-bone fractures are very common in trauma centers. The conventional Arbeitsgemeindschaft fur Osteosynthesefragen (AO) technique contributes to most fracture healing problems, and external fixation technology also has several disadvantages, so new techniques are being explored.
  
  
  METHODS
  A novel hexapod computer-assisted fracture reduction system based on a 3D-CT image reconstruction process is presented for closed reduction of long-bone diaphyseal fractures. A new reduction technique and upgraded reduction device are described and the whole system has been validated.
  
  
  RESULTS
  Ten bovine femoral fracture models were used with random fracture patterns. Tests results were as follows: residual deviation 1.24 + 0.65 mm for the axial deflection, 1.19 + 0.37 mm for the translation, 2.34 + 1.79° for the angulation, and 2.83 + 0.9° for the rotation.
  
  
  CONCLUSIONS
  The reduction mechanism has the advantages of high positioning, reduction and computer accuracy, and intra-operative stability for both patients and surgical team. With further investigation, it could be applied in many kinds of long-bone diaphyseal fractures.
authors.affiliation: Chinese PLA General Hospital, Department of Orthopaedics, Beijing, China.
authors.forename: Peifu
authors.initials: P
authors.lastname: Tang
authors.forename: Lei
authors.initials: L
authors.lastname: Hu
authors.forename: Hailong
authors.initials: H
authors.lastname: Du
authors.forename: Minli
authors.initials: M
authors.lastname: Gong
authors.forename: Lihai
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002417:Cattle; D018483:Diaphyses / Q000601:surgery; D004867:Equipment Design; D005264:Femoral Fractures / Q000601:surgery; D005592:Fracture Fixation / Q000379:methods*; D017102:Fracture Healing; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D009985:Orthopedics / Q000379:methods*; D015203:Reproducibility of Results; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*