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The effect of boundary constraints on finite element modelling of the human pelvis

Watson, Peter; Dostanpor, Ali; Fagan, Michael J.; Dobson, Catherine A.

Abstract

The use of finite element analysis (FEA) to investigate the biomechanics of anatomical systems critically relies on the specification of physiologically representative boundary conditions. The biomechanics of the pelvis has been the specific focus of a number of FEA studies previously, but it is also a key aspect in other investigations of, for example, the hip joint or new design of hip prostheses. In those studies, the pelvis has been modelled in a number of ways with a variety of boundary conditions, ranging from a model of the whole pelvic girdle including soft tissue attachments to a model of an isolated hemi-pelvis. The current study constructed a series of FEA models of the same human pelvis to investigate the sensitivity of the predicted stress distributions to the type of boundary conditions applied, in particular to represent the sacro-iliac joint and pubic symphysis. Varying the method of modelling the sacro-iliac joint did not produce significant variations in the stress distribution, however changes to the modelling of the pubic symphysis were observed to have a greater effect on the results. Over-constraint of the symphysis prevented the bending of the pelvis about the greater sciatic notch, and underestimated high stresses within the ilium. However, permitting medio-lateral translation to mimic widening of the pelvis addressed this problem. These findings underline the importance of applying the appropriate boundary conditions to FEA models, and provide guidance on suitable methods of constraining the pelvis when, for example, scan data has not captured the full pelvic girdle. The results also suggest a valid method for performing hemi-pelvic modelling of cadaveric or archaeological remains which are either damaged or incomplete.

Journal Article Type Article
Publication Date 2017-05
Journal Medical engineering & physics
Print ISSN 1350-4533
Electronic ISSN 1873-4030
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 43
Pages 48-57
DOI https://doi.org/10.1016/j.medengphy.2017.02.001
Keywords Biomechanics; Finite element analysis; Pelvis, Musculoskeletal
Publisher URL http://www.sciencedirect.com/science/article/pii/S1350453317300383
Copyright Statement ©2018, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Additional Information Authors' accepted manuscript of article which has been published in: Medical engineering & physics, 2017, v.43.

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Copyright Statement
©2018, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/



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