Global Journal of Technology and Optimization

Karl-Heinz Widmer

Publications

• Research Article
  True Angle between Anterior-Posterior Impingement in Total Hip Arthroplasty: Why Common Constrained Cups have to Fail
  Author(s): Andrej M. Nowakowski, Sebastian Gehmert, Irène Roesle and Karl-Heinz WidmerAndrej M. Nowakowski, Sebastian Gehmert, Irène Roesle and Karl-Heinz Widmer
  
  Background: Dislocation after total hip arthroplasty is a common complication and partially based on impingement. Questions/purposes: (1) The purpose of this study was to investigate the angle between anterior and posterior impingement in current hip cup designs. (2) Furthermore, the aim was to design a model of an acetabular cup with sparing gaps that match to impact areas. Methods: The range of motion was simulated with Maple R8 software using standard parameters in hip arthroplasty. Afterwards, a preliminary model for an optimized acetabular cup was designed in order to avoid impingement and dislocation. Results: (1) Anterior and posterior areas of impingement were not opposite but twisted by an angle of 108.3°. (2) The two main trajectories of motion were identified and areas with corresponding reductions and elevations were appropriate modified. The improvement resulted in a.. Read More»
  

  Abstract PDF