Hubert, Jan

[["dc.bibliographiccitation.firstpage","3"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Hawellek, Thelonius"],["dc.contributor.author","Lehmann, Andrea"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Saptschak, Julia"],["dc.contributor.author","Doerner, Jochen"],["dc.contributor.author","Raab, Bjoern Werner"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T08:33:37Z"],["dc.date.available","2018-11-07T08:33:37Z"],["dc.date.issued","2009"],["dc.description.abstract","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."],["dc.identifier.isi","000278856100001"],["dc.identifier.pmid","20405809"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17620"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","Non-linearity of flexion-extension characteristics in spinal segments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","281"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Strain"],["dc.bibliographiccitation.lastpage","287"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Mansour, Michael"],["dc.contributor.author","Hawallek, T."],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Naeger, H."],["dc.date.accessioned","2018-11-07T08:55:55Z"],["dc.date.available","2018-11-07T08:55:55Z"],["dc.date.issued","2011"],["dc.description.abstract","To clarify relations between kinematics and mechanics of lumbar spinal segments (L3/L4, L4/L5) versus thoracic T6/T7. Measurements of rotational angle-torque characteristics and migrations of the instantaneous helical axis (IHA) in cyclic segment motions; correlation of IHA-position and differential segment stiffness by applying theorem of Steiner. In neutral axial position of the thoracic segment (alpha = 0), IHA was found within central areas of the intervertebral disc. No change of axial IHA-positions by flexion/extension. In axial rotation IHA-migrations along wide arches from one joint to the other and S-shaped characteristics: strong dependence of IHA-migration and the differential stiffness on the degree of flexion/extension. In flexion/extension, J-shape of the characteristic and simultaneous anterior/posterior IHA-migration. Correlation of initial differential segment stiffness and IHA-position via theorem of Steiner. The following conclusions are obtained: 1. Non-linearity of the characteristics is hardly produced by the soft tissues but mainly by IHA-migration and IHA-tilting. 2. The segment stiffness in axial rotation is parametrically controlled via the degree of additional flexion/extension. 3. The autochthon muscles are able to control the segment stiffness in axial rotation via shifting the resulting force line in anterior/posterior direction without change of its amount about the factor 3-5."],["dc.identifier.doi","10.1111/j.1475-1305.2009.00686.x"],["dc.identifier.isi","000290267900009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23022"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0039-2103"],["dc.title","Parametric Control of the Stiffness of Lumbar Segments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","61"],["dc.bibliographiccitation.journal","JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY"],["dc.bibliographiccitation.lastpage","64"],["dc.bibliographiccitation.volume","60"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Hawellek, Thelonius"],["dc.contributor.author","Mansour, Michael"],["dc.contributor.author","Dorner, J."],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Fanghanel, J."],["dc.contributor.author","Raab, Bjoern-Werner"],["dc.contributor.author","Dumont, B. C."],["dc.contributor.author","Nagerl, H."],["dc.date.accessioned","2018-11-07T11:21:34Z"],["dc.date.available","2018-11-07T11:21:34Z"],["dc.date.issued","2009"],["dc.description.abstract","The report presents measurements of axial rotation of lumbar motion segments (L1/L2, L3/L4, L4/L5), particularly with small angles of rotation (in the range of +/- 1 degrees) following axial force wrenches. The investigation focussed on determining the influence of geametrically varying configurations in axial wrench (consisting of axial torque and axial force) applied on the kinematics (as defined by the migrating instantaneous helical axis, IHA) of lumbar motion segments under constant resulting axial force, and relating IHA-migration to anatomical structures. In all segments, IHA migrated over several centimetres (up to 6 cm). The main portion of IHA-migration was linked to the angle of rotation interval of +/- 1 degrees. 3. The shape of the IHA-migration was greatly dependent upon the position of the force line F(2). The-force-wrench-dependent wide IHA-migration found for the rotational angle interval of +/- 1 degrees suggests that joint guidance predominates in segment kinematics. The segment kinematics can be adjusted by means of the geometrical configuration of the force wrenches. The design of non-fusion spine implants and FE calculations have to take into consideration joint guidance and muscular force distributions with small intervals of axial rotation."],["dc.identifier.isi","000277171500011"],["dc.identifier.pmid","20400794"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6046"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55803"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0867-5910"],["dc.relation.orgunit","Universitätsmedizin Göttingen"],["dc.rights","Goescholar"],["dc.subject.ddc","610"],["dc.subject.mesh","Aged"],["dc.subject.mesh","Humans"],["dc.subject.mesh","Lumbar Vertebrae"],["dc.subject.mesh","Middle Aged"],["dc.subject.mesh","Range of Motion, Articular"],["dc.subject.mesh","Rotation"],["dc.subject.mesh","Stress, Mechanical"],["dc.subject.mesh","Torque"],["dc.subject.mesh","Torsion, Mechanical"],["dc.title","AXIAL ROTATION IN THE LUMBAR SPINE FOLLOWING AXIAL FORCE WRENCH"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","39"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","47"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Hawellek, Thelonius"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Lehmann, Andrea"],["dc.contributor.author","Mansour, Michael"],["dc.contributor.author","Dumont, Clemens"],["dc.contributor.author","Doerner, Jochen"],["dc.contributor.author","Raab, Bjoern Werner"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T08:46:51Z"],["dc.date.available","2018-11-07T08:46:51Z"],["dc.date.issued","2010"],["dc.description.abstract","The biomechanical role of the zygapophysial joints was investigated for axial rotations of lumbar segments by recording the positions of the instantaneous helical axis (IHA) against the axial rotational angle and by relating these IHA-positions to anatomical landmarks. Cyclically varying pure axial moments were applied to 3 L1/L2, 7 L3/L4 and 3 L4/L5 segments. There were 800 segment positions per cycle taken by a custom-made high precision 3D-position measuring system. In intact segments IHA-migration reached from one zygapophysial joint to the other IHA-paths came up to 10-60 mm within small angular intervals (+/- 1 deg). After removing the right joints, IHA-migration remained comparable with that of intact segments only for segment positions rotated to the right. Rotation to the left, however, approximately yielded stationary IHA-positions as found after resection of both joints. Hence, IHA-migration is determined by the joints already for small rotational angles. Each type of segment showed a typical pattern of IHA-migration."],["dc.identifier.isi","000288699300006"],["dc.identifier.pmid","21361255"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20799"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","Migration of the instantaneous axis of motion during axial rotation in lumbar segments and role of the zygapophysial joints"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]