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Spinal biomechanics is still known just fragmentary since the only description by angle-torque characteristics without simultaneous recording of migration of the instantaneous helical axis (IHA) is not sufficient. Time-dependent flexion/extension following a cyclic laterally directed torque was measured at all six degrees of freedom by a highly precise custom-made 6D apparatus. In order to enhance the localizing resolution of IHA migration as the function of the flexional/extensional angle, small ranges of motion (ROM) were used at several degrees of pre-extension. 4 L3/L4, 3 L4/L5 and 2 T2/T3 human segments were investigated. In extensional motion, wide dorsal IHA-migrations were measured in lumbar segments and correlated with the distinct asymmetric shapes of the characteristics in extensional motion. The respective increase of differential stiffness could mainly be traced back to the enlarging geometrical moment of inertia of the segments by the dorsally migrating IHA. Both thoracic segments showed a predominant IHA-migration in cranial/caudal direction. A simple model makes it evident that the opposite curvature morphology of lumbar and thoracic joint facets conditions the different directions of IHA migration.
Czasopismo
Rocznik
Tom
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3--8
Opis fizyczny
Bibliogr. 15 poz., rys.
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autor
autor
autor
autor
autor
autor
autor
autor
autor
autor
- Department of Orthodontics, University of Göttingen, Germany
Bibliografia
- [1] CRISCO J.J., FUJITA L., SPENCINER D.B., The dynamic flexion/extension properties of the lumbar spine in vitro using a novel pendulum system, Journal of Biomechanics, 2007, 40(12), 2767–2773.
- [2] RENNER S.M., NATARAJAN R.N., PATWARDHAN A.G., HAVEY R.M., VORONOV L.I., GUO B.Y., ANDERSSON G.B., AN H.S., Novel model to analyze the effect of a large compressive follower pre-load on range of motions in a lumbar spine, Journal of Biomechanics, 2007, 40(6), 1326–1332.
- [3] WACHOWSKI M.M., MANSOUR M., HAWELLEK T., KUBEINMEESENBURG D., HUBERT J., NÄGERL H., 2009, Parametric Control of the Stiffness of Lumbar Segments, Strain. doi: 10.1111/j.1475-1305.2009.00686.x
- [4] WACHOWSKI M.M., MANSOUR M., LEE C., ACKENHAUSEN A., SPIERING S., FANGHANEL J., DUMONT C., KUBEINMEESENBURG D., NAGERL H., How do spinal segments move? Journal of Biomechanics, 2009, 42(14), 2286–2293.
- [5] ROUSSEAU M.A., BRADFORD D.S., HADI T.M., PEDERSEN K.L., LOTZ J.C., The instant axis of rotation influences facet forces at L5/S1 during flexion/extension and lateral bending, Eur. Spine J., 2006, 15(3), 299–307.
- [6] SCHNELL W., GROSS H., HAUGER W. (eds.), Technische Mechanik, Springer-Verlag, Berlin, Heidelberg, New York, London, Paris, Tokyo, 1989.
- [7] BEATTY M.F., Kinematics of finite rigid-body displacements, J. Physics Am., 1966, 34, 949–955.
- [8] FANGHÄNEL J., SCHULTZ F., Mitteilung über eine Konservierungsflüssigkeit für anatomisches Präpariermaterial, Zeitschrift für Medizinische Labortechnik, 1962, 3, 329–332.
- [9] WILKE H.J., KRISCHAK S., CLAES L.E., Formalin fixation strongly influences biomechanical properties of the spine, Journal of Biomechanics, 1996, 29(12), 1629–1631.
- [10] MANSOUR M., SPIERING S., LEE C., DATHE H., KALSCHEUER A.K., KUBEIN-MEESENBURG D., NAGERL H., Evidence for IHA migration during axial rotation of a lumbar spine segment by using a novel high-resolution 6D kinematic tracking system, Journal of Biomechanics, 2004, 37(4), 583–592.
- [11] MEYER E., GUICKING D., Schwingungslehre, Vieweg-Verlag, Braunschweig, 1974.
- [12] ANETZBERGER H., FRIEDLE H.P., PUTZ R., TRENTZ O. (eds.), Posttraumatische Defekt und Infektsanierung, Schädel, Wirbelsäule, Becken, Georg Thieme Verlag, Stuttgart, New York, 1997.
- [13] KUBEIN-MEESENBURG D., NAGERL H., FANGHANEL J., Elements of a general theory of joints. 1. Basic kinematic and static function of diarthrosis, Anatomischer Anzeiger, 1990, 170(3–4), 301–308.
- [14] NAGERL H., KUBEIN-MEESENBURG D., FANGHANEL J., Elements of a general theory of joints. 7. Mechanical structures of the relative motion of adjacent vertebrae, Ann. Anat., 1992, 174(1), 66–75.
- [15] WOLF K., Lehrbuch der technischen Mechanik starrer Systeme, Springer, Wien, 1947.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPBB-0001-0035