Effect of bone graft characteristics on the mechanical behavior of the lumbar spine.

  • Zander T
  • Rohlmann A
  • Kl�ckner C
 et al. 
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Abstract

There is little information about the influence of bone graft size,
position and elasticity on the mechanical behavior of the lumbar
spine. Intersegmental motion, intradiscal pressure and stresses in
the lumbar spine were calculated using a three-dimensional, nonlinear
finite element model which included an internal spinal fixation device
and a bone graft. Cross-sectional area, position, and elastic modulus
of the graft were varied in this study. Bone grafts, especially very
stiff ones, increase stresses on adjacent endplates. Though larger
grafts lead to less contact pressure, it is difficult to judge the
quality of different bone graft positions. In general, ventral flexion
results in lower maximum contact pressure than lateral bending. There
is always little intersegmental rotation in the bridged region compared
with that of an intact spine.A larger graft with low stiffness should
be favored from a mechanical point of view. Patients should avoid
lateral bending of the upper body shortly after surgery.

Author-supplied keywords

  • Biomechanics; Bone Transplantation; Cadaver; Elast
  • Mechanical

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  • PMID: 11934418

Authors

  • Thomas Zander

  • Antonius Rohlmann

  • Constantin Kl�ckner

  • Georg Bergmann

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