caa a22 4500 445835117 CHVBK 20180317145328.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00586-011-1817-3 doi (NATIONALLICENCE)springer-10.1007/s00586-011-1817-3 Effect of the cord pretension of the Dynesys dynamic stabilisation system on the biomechanics of the lumbar spine: a finite element analysis [Elektronische Daten] [Chien-Lin Liu, Zheng-Cheng Zhong, Hung-Wei Hsu, Shih-Liang Shih, Shih-Tien Wang, Chinghua Hung, Chen-Sheng Chen] The Dynesys dynamics stabilisation system was developed to maintain the mobility of motion segment of the lumbar spine in order to reduce the incidence of negative effects at the adjacent segments. However, the magnitude of cord pretension may change the stiffness of the Dynesys system and result in a diverse clinical outcome, and the effects of Dynesys cord pretension remain unclear. Displacement-controlled finite element analysis was used to evaluate the biomechanical behaviour of the lumbar spine after insertion of Dynesys with three different cord pretensions. For the implanted level, increasing the cord pretension from 100 to 300N resulted in an increase in flexion stiffness from 19.0 to 64.5Nm/deg, a marked increase in facet contact force (FCF) of 35% in extension and 32% in torsion, a 40% increase of the annulus stress in torsion, and an increase in the high-stress region of the pedicle screw in flexion and lateral bending. For the adjacent levels, varying the cord pretension from 100 to 300N only had a minor influence on range of motion (ROM), FCF, and annulus stress, with changes of 6, 12, and 9%, respectively. This study found that alteration of cord pretension affects the ROM and FCF, and annulus stress within the construct but not the adjacent segment. In addition, use of a 300N cord pretension causes a much higher stiffness at the implanted level when compared with the intact lumbar spine. Springer-Verlag, 2011 Lumbar spine nationallicence Biomechanics nationallicence Dynesys dynamic stabilisation system nationallicence Finite element method nationallicence Cord pretension nationallicence Liu Chien-Lin Department of Orthopaedic Surgery, Taipei-Veterans General Hospital, Taipei, Taiwan aut Zhong Zheng-Cheng Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut Hsu Hung-Wei Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut Shih Shih-Liang Department of Orthopaedic Surgery, Taipei-City Hospital, Taipei, Taiwan aut Wang Shih-Tien Department of Orthopaedic Surgery, Taipei-Veterans General Hospital, Taipei, Taiwan aut Hung Chinghua National Chiao-Tung University, Taipei, Taiwan aut Chen Chen-Sheng Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut European Spine Journal Springer-Verlag 20/11(2011-11-01), 1850-1858 0940-6719 20:11<1850 2011 20 586 https://doi.org/10.1007/s00586-011-1817-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-011-1817-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Chien-Lin Department of Orthopaedic Surgery, Taipei-Veterans General Hospital, Taipei, Taiwan aut NATIONALLICENCE 700 1- Zhong Zheng-Cheng Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut NATIONALLICENCE 700 1- Hsu Hung-Wei Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut NATIONALLICENCE 700 1- Shih Shih-Liang Department of Orthopaedic Surgery, Taipei-City Hospital, Taipei, Taiwan aut NATIONALLICENCE 700 1- Wang Shih-Tien Department of Orthopaedic Surgery, Taipei-Veterans General Hospital, Taipei, Taiwan aut NATIONALLICENCE 700 1- Hung Chinghua National Chiao-Tung University, Taipei, Taiwan aut NATIONALLICENCE 700 1- Chen Chen-Sheng Department of Physical Therapy and Assistive Technology, National Yang-Ming University, 155, Sec. 2, Li-Nung St., 112, Taipei, Taiwan aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/11(2011-11-01), 1850-1858 0940-6719 20:11<1850 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer