title: Evaluation of the screw position and angle using a post-contoured plate in the open wedge high tibial osteotomy according to the correction degree and surgical technique.
abstract: BACKGROUND
  The purpose of the present study was to evaluate the screw insertion angle and orientation with an anatomical plate that is post-contoured to the surface geometry of the proximal tibia after open wedge high tibial osteotomy.
  
  
  METHODS
  From March 2012 to June 2014, 31 uni-planar and 38 bi-planar osteotomies were evaluated. Postoperative computed tomography data obtained after open wedge high tibial osteotomy using a locking plate were used for reconstruction of the 3 dimensional model with Mimics v.16.0 of the proximal tibia and locking plate. Measurement data were compared between 2 groups (gap lesser than or equal to 10mm (Group 1) and gap greater than 10mm(Group 2)). These data were also compared between the uniplanar (Group 3) and bi-planar (Group 4) osteotomy groups.
  
  
  RESULTS
  Dimensions of the medial proximal tibia of the sagittal plane, positions of the screw hole in the sagittal plane, and angles of screw insertion of all planes were not statistically different, regardless of the correction degree and operative technique. Additionally, angles of screw insertion were larger at the most anterior and posterior screw in the axial plane and most inferior screw showed smallest angle in the coronal plane.
  
  
  CONCLUSIONS
  Using a post-contoured plate, the position and angle of the screw insertion were not different in the direction of the lateral hinge, regardless of the correction degree and operative technique. This could imply that it could be used universally in the open wedge high tibial osteotomy.
authors.affiliation: Central R&D Center, Corentec Co Ltd., South Korea.
authors.forename: Oui Sik
authors.initials: OS
authors.lastname: Yoo
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Bundang Hospital, South Korea. Electronic address: smcos1@daum.net.
authors.forename: Yong Seuk
authors.initials: YS
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, South Korea.
authors.forename: Myung Chul
authors.initials: MC
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Seoul National University College of Medicine, Bundang Hospital, South Korea.
authors.forename: Ashraf
authors.initials: A
authors.lastname: Elazab
authors.affiliation: Central R&D Center, Corentec Co Ltd., South Korea.
authors.forename: Deok Gill
authors.initials: DG
authors.lastname: Choi
authors.affiliation: Central R&D Center, Corentec Co Ltd., South Korea.
authors.forename: Young Woong
authors.initials: YW
authors.lastname: Jang
mesh_terms: D000328:Adult; D000368:Aged; D001860:Bone Plates; D001863:Bone Screws; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D010027:Osteotomy / Q000295:instrumentation* / Q000379:methods; D011184:Postoperative Period; D013977:Tibia / Q000601:surgery*; D014057:Tomography, X-Ray Computed
keywords: Computed tomography; High tibial osteotomy; Plate; Screw; Stability