The biomechanical influence of the facet joint orientation and the facet tropism in the lumbar spine |
| |
| Affiliation: | 1. Spine Center and Department of Orthopaedic Surgery, Seoul National University College of Medicine and Seoul National University Bundang Hospital, 166 Gumiro, Bundang-gu, Sungnam 463-707, Republic of Korea;2. Department of Mechanical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, Republic of Korea;3. Department of Orthopaedic Surgery, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul, Republic of Korea;4. Department of Orthopaedic Surgery, Seoul National University College of Medicine and Seoul National University Hospital, 101 Daehangno, Jongno-gu, Seoul 110-744, Republic of Korea;1. University of Kansas, Mechanical Engineering, 1530 W 15th Street, Learned Hall Room 3138, Lawrence, KS 66045, USA;2. Children''s Mercy Hospital and Clinics of Kansas City, Orthopaedic Surgery, 2401 Gillham Road, Kansas City MO 64108, USA;3. University of Kansas Medical Center, Department of Neurosurgery, 3901 Rainbow Bvld., MS 3021, Kansas City, KS 66160, USA;4. University of Kansas, Mechanical Engineering, 1530 W 15th Street, Learned Hall Room 3138, Lawrence, KS 66045, USA;1. Charité – Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany;2. Institute of Radiology, Ortenau Klinikum Offenburg-Kehl, Ebertplatz 12, 77654 Offenburg, Germany;3. Institute for Social Medicine, Epidemiology and Health Economics at Charité – Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany;4. Center for Musculoskeletal Surgery at Charité – Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany;5. Büttner-Janz Spinefoundation, Meinekestraße 6, 10719 Berlin, Germany;1. Department of Civil and Environmental Engineering, University of Alberta, Canada;2. Department of Radiology and Diagnostic Imaging, University of Alberta, Canada;1. Department of Orthopaedics, Changzheng Hospital Affiliated to the Second Military Medical University, Shanghai, China;2. Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China;3. Science and Engineering Faculty, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia |
| |
| Abstract: | ![]()
Background contextFacet joint orientation and facet tropism (FT) are presented as the potential anatomical predisposing factors for lumbar degenerative changes that may lead in turn to early degeneration and herniation of the corresponding disc or degenerative spondylolisthesis. However, no biomechanical study of this concept has been reported.PurposeTo investigate the biomechanical influence of the facet orientation and FT on stress on the corresponding segment.Study designFinite element analysis.MethodsThree models, F50, F55, and F60 were simulated with different facet joint orientations (50°, 55°, and 60° relative to coronal plane) at both L2–L3 facet joints. A FT model was also simulated to represent a 50° facet joint angle at the right side and a 60° facet joint angle at the left side in the L2–L3 segment. In each model, the intradiscal pressures were investigated under four pure moments and anterior shear force. Facet contact forces at the L2–L3 segment were also analyzed under extension and torsion moments and anterior shear force. This study was supported by 5000 CHF grant of 2011 AO Spine Research Korea fund. The authors of this study have no topic-specific potential conflicts of interest related to this study.ResultsThe F50, F55, and F60 models did not differ in the intradiscal pressures generated under four pure moments: but under anterior shear force, the F60 and FT models showed increases of intradiscal pressure. The F50 model under extension and the F60 model under torsion each generated an increase in facet contact force. In all conditions tested, the FT model yielded the greatest increase of intradiscal pressure and facet contact force of all the models.ConclusionsThe facet orientation per se did not increase disc stress or facet joint stress prominently at the corresponding level under four pure moments, but FT could make the corresponding segment more vulnerable to external moments or anterior shear force. |
| |
| Keywords: | Spondylolisthesis Facet joint orientation Facet tropism Finite element model |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
