Development and calibration of a probabilistic finite element hip capsule representation

Casey A. Myers, Clare K. Fitzpatrick, Daniel N. Huff, Peter J. Laz and Paul J. Rullkoetter

Computer Methods in Biomechanics and Biomedical Engineering, 2020, vol. 23, issue 11, 755-764

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.

Date: 2020
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DOI: 10.1080/10255842.2020.1764543

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