{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,5]],"date-time":"2026-09-05T00:47:51Z","timestamp":1788569271657,"version":"build-2803163510"},"reference-count":156,"publisher":"Public Library of Science (PLoS)","issue":"4","license":[{"start":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T00:00:00Z","timestamp":1619395200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Open Access Publication Funds of the Ruhr-University Bochum"},{"name":"German Federal Ministry for Economic Affairs and Energy","award":["ZF4060725AJ8"],"award-info":[{"award-number":["ZF4060725AJ8"]}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>In computational biomechanics, two separate types of models have been used predominantly to enhance the understanding of the mechanisms of action of the lumbosacral spine (LSS): Finite element (FE) and musculoskeletal multibody (MB) models. To combine advantages of both models, hybrid FE-MB models are an increasingly used alternative. The aim of this paper is to develop, calibrate, and validate a novel passive hybrid FE-MB open-access simulation model of a ligamentous LSS using ArtiSynth. Based on anatomical data from the Male Visible Human Project, the LSS model is constructed from the L1-S1 rigid vertebrae interconnected with hyperelastic fiber-reinforced FE intervertebral discs, ligaments, and facet joints. A mesh convergence study, sensitivity analyses, and systematic calibration were conducted with the hybrid functional spinal unit (FSU) L4\/5. The predicted mechanical responses of the FSU L4\/5, the lumbar spine (L1-L5), and the LSS were validated against literature data from in vivo and in vitro measurements and in silico models. Spinal mechanical responses considered when loaded with pure moments and combined loading modes were total and intervertebral range of motions, instantaneous axes and centers of rotation, facet joint contact forces, intradiscal pressures, disc bulges, and stiffnesses. Undesirable correlations with the FE mesh were minimized, the number of crisscrossed collagen fiber rings was reduced to five, and the individual influences of specific anatomical structures were adjusted to in vitro range of motions. Including intervertebral motion couplings for axial rotation and nonlinear stiffening under increasing axial compression, the predicted kinematic and structural mechanics responses were consistent with the comparative data. The results demonstrate that the hybrid simulation model is robust and efficient in reproducing valid mechanical responses to provide a starting point for upcoming optimizations and extensions, such as with active skeletal muscles.<\/jats:p>","DOI":"10.1371\/journal.pone.0250456","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T19:35:02Z","timestamp":1619465702000},"page":"e0250456","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":24,"title":["Calibration and validation of a novel hybrid model of the lumbosacral spine in ArtiSynth\u2013The passive structures"],"prefix":"10.1371","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3695-6595","authenticated-orcid":true,"given":"Robin","family":"Remus","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Lipphaus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Neumann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beate","family":"Bender","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2021,4,26]]},"reference":[{"key":"pone.0250456.ref001","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1080\/17453674.1998.11744790","article-title":"Epidemiology of low back pain","volume":"69","author":"GBJ Andersson","year":"1998","journal-title":"Acta Orthopaedica Scandinavica"},{"key":"pone.0250456.ref002","volume-title":"BKK Gesundheitsatlas","author":"K Kliner","year":"2019"},{"key":"pone.0250456.ref003","doi-asserted-by":"crossref","first-page":"793","DOI":"10.1097\/00007632-199107000-00018","article-title":"The intersegmental and multisegmental muscles of the lumbar spine. 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