title: A three-dimensional parameterized and visually kinematic simulation module for the theoretical range of motion of total hip arthroplasty.
abstract: BACKGROUND
  Proper option and optimal alignment of implants are major factors in obtaining the desired range of motion of total hip arthroplasty. It would be very useful if a tool is available to assist clinicians to preoperatively determine proper implants and their optimal intraoperative alignment for individual patient.
  
  
  METHODS
  Based on the secondary development function of ADAMS/VIEW, a three-dimensional parameterized module was developed to simulate six motions of implants for total hip arthroplasty. Total eight parameters (stem abduction, acetabular size, head size, general head-neck ratio, stem-neck angle, acetabular anteversion, acetabular inclination and femoral antetorsion) were included and three definitions of acetabular orientations (operative, radiographic and anatomical) were available. Any initial position of implants and simulation precision could be defined on the demand.
  
  
  RESULTS
  After entering these eight parameters, a special model of total hip arthroplasty would be constructed. Single or combined motion until the prosthetic impingement could be simulated visually and the corresponding maximal rotation angle would be quantified.
  
  
  CONCLUSIONS
  Clinical factors, such as patients with severe deformity of hip joint or a large range of motion demand, should be considered during total hip arthroplasty. This module can provide references for clinicians on proper option and intraoperative implantation of components, and be suitable for postoperative evaluation. Furthermore, it is a tool to investigate the "safe-zones" of total hip arthroplasty and also can be employed for the design of new implant system.
authors.affiliation: Institute of Biomedical Manufacturing and Life Quality Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China. emilia_jj@sjtu.edu.cn
authors.forename: Wen-Ting
authors.initials: WT
authors.lastname: Ji
authors.forename: Kai
authors.initials: K
authors.lastname: Tao
authors.forename: Cheng-Tao
authors.initials: CT
authors.lastname: Wang
mesh_terms: D000077:Acetabulum / Q000502:physiology* / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D017076:Computer-Aided Design; D006622:Hip Prosthesis; D006801:Humans; D021621:Imaging, Three-Dimensional; D016059:Range of Motion, Articular / Q000502:physiology*; D012984:Software