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Development and calibration of a probabilistic finite element hip capsule representation

Author

Listed:
  • Casey A. Myers
  • Clare K. Fitzpatrick
  • Daniel N. Huff
  • Peter J. Laz
  • Paul J. Rullkoetter

Abstract

The objective of this study was to develop a probabilistic representation of the hip capsule, which is calibrated to experimental capsular torque-rotation behavior and captures the observed variability for use in population-based studies. A finite element model of the hip capsule was developed with structures composed of a fiber-reinforced membrane, represented by 2D quadrilateral elements embedded with tension-only non-linear spring. An average capsule representation was developed by calibrating ligament properties (linear stiffness, reference strain) so that torque-rotation behavior matched mean cadaveric data. A probabilistic capsule was produced by determining the ligament property variability which represented ±2 SD measured in the experiment. Differences between experimental and model kinematics across all positions had RMS error of 4.7°. Output bounds from the optimized probabilistic capsule representation were consistent with ±2 SD of experimental data; the overall RMS error was 5.1°. This model can be employed in population-based finite element studies of THA to assess mechanics in realistic scenarios considering implant design, as well as surgical and patient factors.

Suggested Citation

  • Casey A. Myers & Clare K. Fitzpatrick & Daniel N. Huff & Peter J. Laz & Paul J. Rullkoetter, 2020. "Development and calibration of a probabilistic finite element hip capsule representation," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 23(11), pages 755-764, August.
    • Handle: RePEc:taf:gcmbxx:v:23:y:2020:i:11:p:755-764
    DOI: 10.1080/10255842.2020.1764543
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