Development, Simulation-Based Design and Metal Forming Production of Patient-Individual Hip Cups

  • B.-A. Behrens
  • N. Weigel
  • S. B. Escobar
  • C. Stukenborg-Colsman
  • M. Lerch
  • I. Nolte
  • P. Wefstaedt
  • A. Bouguecha
Conference paper

Abstract

The present project is based on previous gait analysis studies of normal human walking and finite element (FE) simulations of the strain-adaptive bone remodeling in the pelvis. For the FE simulation, hip joint forces were derived from the multi-body simulation (MBS) of the gait cycle of a human test subject with normal walking speed (1.1 m/s). An overall bone mass loss of 1.4% can be expected for the pelvis after total hip arthroplasty (THA) according to the calculation. On the basis of the final density distribution in the acetabulum a proximal migration of the implant can be suggested.

With patient-individual hip cups bone resorption and subsequent cup migration is not assumed to appear to such an extent. Until now, patient-individual hip prostheses are mainly used for severe deformities of the pelvis or in case of tumors. This is due to the cost-effective production of the single components using rapid prototyping technologies, for example.

In the framework of this project, an innovative concept based on numerical calculations is developed, so that besides the specific preconditions of medical engineering the cost advantages of large-scale sheet metal forming can be combined with the individuality of piece production. Sheet metal forming is predestined for this, if only for the production of a high quantity of the same component.

Keywords

Bone Mass Loss Normal Walking Speed Retro Reflective Marker Inverse Dynamic Simulation Gait Analysis Study 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

The study is based on the framework of the Collaborative Research Center 599 “Sustainable degradable and permanent implants out of metallic and ceramic materials” and is a part of the subprojects D6 and D13. The authors would like to thank the German Research Foundation (DFG) for the financial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • B.-A. Behrens
    • 1
  • N. Weigel
    • 1
  • S. B. Escobar
    • 1
  • C. Stukenborg-Colsman
    • 1
  • M. Lerch
    • 1
  • I. Nolte
    • 2
  • P. Wefstaedt
    • 3
  • A. Bouguecha
    1. 1.Institute of Metal Forming and Metal Forming MachinesLeibniz Universität HannoverGarbsenGermany
    2. 2.Department of Orthopaedic SurgeryHannover Medical SchoolHannoverGermany
    3. 3.Small Animal ClinicUniversity of Veterinary Medicine Hannover, FoundationHannoverGermany

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