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  • 1
    Electronic Resource
    Electronic Resource
    Biomechanical behaviour in vitro of the spine and lumbosacral junction (2000)
    Springer
    Surgical and radiologic anatomy 21 (2000), S. 377-381 
    Details
    ISSN: 1279-8517
    Keywords: Sacroiliac ; Mobility ; Vertebral column ; Biomechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Six fresh human specimens extending from the 9th thoracic vertebra (T9) to the pelvis were used to study the biomechanical behaviour of the long lumbopelvic segments, including mobility of the sacrum. The loads were applied at T9 using pure couples up to 5Nm. The displacements were measured by an optoelectronic method (VICON 140). Stress-displacement curves were obtained for the three angular components of the vertebra studied according to the plane of the principal stresses and of the two other planes corresponding to the coupled mobilities. Mobility decreased from T9 to the sacrum. There was mobility of the sacrum in relation to the pelvis in flexion, with a mean of 1.28° (0.5 to 2.8°) 3 sacrums showed a mobility of the order of one degree for torsional stresses. There was no sacral mobility during stresses in lateral flexion. The use of this experimental protocol with low mechanical stresses should allow the evaluation of long osteosyntheses extending to the sacrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00276-999-0377-2
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Biomechanical behaviourin vitro of the spine and lumbosacral junction (1999)
    Springer
    Surgical and radiologic anatomy 21 (1999), S. 377-381 
    Details
    ISSN: 1279-8517
    Keywords: Sacroiliac ; Mobility ; Vertebral column ; Biomechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Six pièces anatomiques humaines fraîches, allant de la 9ème vertèbre thoracique (T9) au pelvis ont été utilisées pour étudier le comportement biomécanique de segments longs lombopelviens intégrant la mobilité du sacrum. Les charges étaient appliquées en T9 selon des couples purs jusqu'à 5Nm. Les déplacements étaient mesurés par un procédé optoélectronique (Vicon 140). Des courbes effort-déplacement ont été obtenues pour les trois composantes angulaires de la vertèbre étudiée selon le plan de sollicitations principales et selon les deux autres plans correspondant aux mobilités couplées. Les mobilités décroissaient de T9 au sacrum. Il existait une mobilité du sacrum par rapport au bassin en flexion avec une moyenne de 1.28° (0,5 à 2,8°); 3 sacrums présentaient une mobilité de l'ordre du degré pour des sollicitations en torsion. Il n'existait pas de mobilité sacrée lors des sollicitations en inflexion latérale. L'utilisation de ce protocole expérimental, avec des sollicitations mécaniques faibles, doit permettre l'évaluation d'ostéosynthèses longues étendues jusqu'au sacrum.
    Notes: Summary Six fresh human specimens extending from the 9th thoracic vertebra (T9) to the pelvis were used to study the biomechanical behaviour of the long lumbopelvic segments, including mobility of the sacrum. The loads were applied at T9 using pure couples up to 5Nm. The displacements were measured by an optoelectronic method (VICON 140). Stress-displacement curves were obtained for the three angular components of the vertebra studied according to the plane of the principal stresses and of the two other planes corresponding to the coupled mobilities. Mobility decreased from T9 to the sacrum. There was mobility of the sacrum in relation to the pelvis in flexion, with a mean of 1.28° (0.5 to 2.8°); 3 sacrums showed a mobility of the order of one degree for torsional stresses. There was no sacral mobility during stresses in lateral flexion. The use of this experimental protocol with low mechanical stresses should allow the evaluation of long osteosyntheses extending to the sacrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01631345
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    CDH: preliminary report on a new anterior spinal instrumentation (1995)
    Springer
    European spine journal 4 (1995), S. 194-199 
    Details
    ISSN: 1432-0932
    Keywords: CDH (Cotrel-Dubousset-Hopf) ; Primary stability ; Mono-and multisegmental anterior device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary CDH (Cotrel-Dubousset-Hopf) instrumentation was developed with the aim of improving stability in ventral operation procedure and facilitating treatment of all anterior spinal diseases. The implantation of anterior plates and drawers, the use of a double-rod fixation within the implant in nonparallel directions, which provide an automatic locking mechanism against displacement, the prevention of dislocation of the cancellous bone srews, and the crosslink principle are its main characteristics. The device can be applied to the spine in accordance with its three-dimensional anatomy by any kind of force (distraction, compression, and rotation). Additional posterior instrumentation and postoperative external support are unnecessary in most cases because of improved stability. No reoperation was necessary following the mono- and multisegmental application of this method in 60 patients (28 with scoliosis, 12 with spondylodiscitis, 8 with primary tumors or isolated metastasis, 6 with fractures, 3 with failed back syndrome, 1 with kyphotic deformity, 1 with spondylolisthesis on two levels, and 1 with loss of correction after the dislocation of another posterior spinal instrumentation). Average blood loss was 950 ml; the average operating time was 3 h. In all, 16 monosegmental and 44 multisegmental procedures were carried out. In 25 patients, in particular those with paralytic scoliosis, a double-stage anterior and posterior spondylodesis was done.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298246
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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