Biomechanic analysis of a double hybrid fixation in the lumbar spine

J. Cabello Gallardo, J. Roca Burniol, M. Iborra González, J. J. Vázquez Solsona

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1 Citation (Scopus)


Objetive: to evaluate the biomechanics effects of the double hybrid fixation, rigid and dynamic, over the adjacent non-fixated level in the lumbar spine. Methods: using six specimens, L3-S1, from human lumbar spine, the measurement of the intradiscal pressure (IDP) in the disc L3-L4, L4-L5 and L5-S1, were performed in the following conditions: non-fixated specimen, with rigid fixation in L5-S1 and double hybrid fixation in L4-S1. The six specimens were subjected to progressive load until 750 N in axial compression, flexion and extension. Results: in the upper adjacent disc to the dynamic stabilization, L3-L4 disc, the IDP increased about 10%. In disc L4-L5 the posterior dynamic fixation the IDP decreased 50% and the IDP of disc with rigid fixation L5-S1 was reduced over 65%. Conclusion: the IDP of non-fixated segment adjacent to a dynamic implant is much lesser that in rigid fixations and the system provided protection to the disc over the rigid fixation.
Original languageEnglish
Pages (from-to)74-82
JournalTrauma (Majadahonda)
Issue number2
Publication statusPublished - 1 Apr 2008


  • Dynamic stabilization
  • Intradisc pressure
  • Lumbar spine


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