Development and calibration of a probabilistic finite element hip capsule representation. Issue 11 (17th August 2020)

• Record Type: Journal Article
• Authors: Myers, Casey A.; Fitzpatrick, Clare K.; Huff, Daniel N.; Laz, Peter J.; Rullkoetter, Paul J.
• Is Part Of: Computer methods in biomechanics and biomedical engineering. Volume 23:Issue 11(2020)
• Page Start: 755
• Page End: 764
• Publication Date: 2020-08-17
• Subjects: Hip -- ligament -- biomechanics -- finite element analysis -- probabilistic; Biomechanics -- Data processing -- Periodicals; Biomedical engineering -- Periodicals; Biomechanics -- Periodicals; Biomedical Engineering -- methods -- Periodicals; Computing Methodologies -- Periodicals; 612.7
• DOI: 10.1080/10255842.2020.1764543
• Languages: English
• ISSNs: 1025-5842

Abstract

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.