title: Application of computer-aided design and 3D-printed navigation template in Locking Compression Pediatric Hip PlateΤΜplacement for pediatric hip disease.
abstract: To investigate the feasibility and accuracy of a drill template based on computer-aided design (CAD) and 3D printing technology for the placement of screws in Locking Compression Pediatric Hip Plate (LCP-PHP).
  
  
  
  LCP-PHP was used in 11 children [5 with femoral neck fracture and 6 with development dysplasia of hip (DDH)]. Using the CT data, the proximal femur model was created by a 3D printer. Fracture reduction and the placement of the screw in the femoral neck and the LCP-PHP were simulated by the computer. The navigation template was designed by the software to match the proximal femur. After the feasibility of the 3D model operation was demonstrated before the operation, the guide pins and the screws were inserted with the help of the navigate template in the operation.
  
  
  
  During surgery, the navigation template for each case was matched to the bony markers of the proximal femur. With the help of the template, in femoral neck fracture cases, three screws could be accurately inserted into the femoral neck to implant the LCP-PHP and stabilize the fracture. The template for DDH includes all operation parameters and steps for proximal femoral varus rotation and shortening osteotomy, which made the surgery much easier to perform. Radiographs taken after surgery showed that the postoperative results closely corresponded to the preoperative computer simulation. The average time taken for LCP-PHP placement was 26.5 min; radiography was used during surgery only for an average of 6.0 times. Postoperative radiographs showed good results.
  
  
  
  With the use of CAD and 3D printing technology, accurate placement of individualized navigation template of LCP-PHP can be achieved. This technology can reduce intraoperative damage to the femoral neck epiphysis, decrease operation time, reduce intraoperative hemorrhage, and decrease radiation exposure to patients and personnel during the surgery.
authors.affiliation: Department of Pediatric Orthopaedics, Children's Hospital, Nanjing Medical University, Nanjing, 210008, Jiangsu, China.|Digital Medicine Institute, Nanjing Medical University, Nanjing, 210006, Jiangsu, China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Zheng
authors.affiliation: Digital Medicine Institute, Nanjing Medical University, Nanjing, 210006, Jiangsu, China.|Department of Orthopedics, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, Jiangsu, China.
authors.forename: Qingqiang
authors.initials: Q
authors.lastname: Yao
authors.affiliation: Department of Pediatric Orthopaedics, Children's Hospital, Nanjing Medical University, Nanjing, 210008, Jiangsu, China.|Digital Medicine Institute, Nanjing Medical University, Nanjing, 210006, Jiangsu, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Xu
authors.affiliation: Digital Medicine Institute, Nanjing Medical University, Nanjing, 210006, Jiangsu, China. limingwangnj@sina.com.|Department of Orthopedics, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, Jiangsu, China. limingwangnj@sina.com.
authors.forename: Liming
authors.initials: L
authors.lastname: Wang
mesh_terms: D001858:Bone Nails; D001860:Bone Plates; D001863:Bone Screws; D002648:Child; D002675:Child, Preschool; D003198:Computer Simulation; D017076:Computer-Aided Design; D044962:Data Compression; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000379:methods; D050723:Fractures, Bone / Q000000981:diagnostic imaging; D006618:Hip Dislocation, Congenital / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008953:Models, Anatomic; D010027:Osteotomy / Q000379:methods*; D011312:Pressure; D066330:Printing, Three-Dimensional; D014057:Tomography, X-Ray Computed / Q000379:methods
keywords: 3D printing technology; Computer-aided design; Locking Compression Pediatric Hip Plate; Navigation template