title: [Application of 3D printing and computer-assisted surgical simulation in preoperative planning for acetabular fracture].
abstract: OBJECTIVE
  To evaluate the feasibility and effectiveness of using 3D printing and computer-assisted surgical simulation in preoperative planning for acetabular fractures.
  
  
  METHODS
  A retrospective analysis was performed in 53 patients with pelvic fracture, who underwent surgical treatment between September, 2013 and December, 2015 with complete follow-up data. Among them, 19 patients were treated with CT three-dimensional reconstruction, computer-assisted virtual reset internal fixation, 3D model printing, and personalized surgery simulation before surgery (3D group), and 34 patients underwent routine preoperative examination (conventional group). The intraoperative blood loss, transfusion volume, times of intraoperative X-ray, operation time, Matta score and Merle D' Aubigne & Postel score were recorded in the 2 groups. Preoperative planning and postoperative outcomes in the two groups were compared.
  
  
  RESULTS
  All the operations were completed successfully. In 3D group, significantly less intraoperative blood loss, transfusion volume, fewer times of X-ray, and shortened operation time were recorded compared with those in the conventional group (P<0.05). According to the Matta scores, excellent or good fracture reduction was achieved in 94.7% (18/19) of the patients in 3D group and in 82.4% (28/34) of the patients in conventional group; the rates of excellent and good hip function at the final follow-up were 89.5% (17/19) in the 3D group and 85.3% (29/34) in the conventional group (P>0.05). In the 3D group, the actual internal fixation well matched the preoperative design.
  
  
  CONCLUSIONS
  3D printing and computer-assisted surgical simulation for preoperative planning is feasible and accurate for management of acetabular fracture and can effectively improve the operation efficiency.
authors.affiliation: Department of Orthopedics, Third Affiliated Hospital of Southern Medical University/Academy of Orthopedics of Guangdong Province, Guangzhou 510630, China.E-mail: liuxin_smu@sina.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Can-Jun
authors.initials: CJ
authors.lastname: Zeng
authors.forename: Jian-Sen
authors.initials: JS
authors.lastname: Lu
authors.forename: Xu-Chen
authors.initials: XC
authors.lastname: Lin
authors.forename: Hua-Jun
authors.initials: HJ
authors.lastname: Huang
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Tan
authors.forename: Dao-Zhang
authors.initials: DZ
authors.lastname: Cai
mesh_terms: D005593:Fracture Fixation, Internal; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans; D010384:Pelvic Bones; D066330:Printing, Three-Dimensional; D012189:Retrospective Studies; D025321:Surgery, Computer-Assisted; D016896:Treatment Outcome