title: Hip2Norm: an object-oriented cross-platform program for 3D analysis of hip joint morphology using 2D pelvic radiographs.
abstract: We developed an object-oriented cross-platform program to perform three-dimensional (3D) analysis of hip joint morphology using two-dimensional (2D) anteroposterior (AP) pelvic radiographs. Landmarks extracted from 2D AP pelvic radiographs and optionally an additional lateral pelvic X-ray were combined with a cone beam projection model to reconstruct 3D hip joints. Since individual pelvic orientation can vary considerably, a method for standardizing pelvic orientation was implemented to determine the absolute tilt/rotation. The evaluation of anatomically morphologic differences was achieved by reconstructing the projected acetabular rim and the measured hip parameters as if obtained in a standardized neutral orientation. The program had been successfully used to interactively objectify acetabular version in hips with femoro-acetabular impingement or developmental dysplasia. Hip(2)Norm is written in object-oriented programming language C++ using cross-platform software Qt (TrollTech, Oslo, Norway) for graphical user interface (GUI) and is transportable to any platform.
authors.affiliation: M.E. Müller Research Center for Orthopaedic Surgery, Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. Guoyan.Zheng@MEMcenter.unibe.ch
authors.forename: G
authors.initials: G
authors.lastname: Zheng
authors.forename: M
authors.initials: M
authors.lastname: Tannast
authors.forename: C
authors.initials: C
authors.lastname: Anderegg
authors.forename: K A
authors.initials: KA
authors.lastname: Siebenrock
authors.forename: F
authors.initials: F
authors.lastname: Langlotz
mesh_terms: D000077:Acetabulum / Q000473:pathology; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional; D011859:Radiography; D012399:Rotation; D013557:Switzerland