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Versteifungseinfluss eines transsakralen Fusionssystems

Eine probabilistische Finite-Elemente-Analyse und Sensitivitätsstudie

Stiffening effect of a transsacral fusion system for the lumbosacral junction

A probabilistic finite element analysis and sensitivity study

Der Orthopäde volume 40, pages 162–168 (2011)Cite this article

Zusammenfassung

Das neuartige transsakrale Fusionssystem AxiALIF erlaubt die Stabilisierung des lumbosakralen Übergangs. Das System besteht aus einer Schraube, die 2 unterschiedliche Durchmesser hat. Durch zusätzliche Facettenschrauben oder Fixateure kann eine 360°-Fusion erreicht werden. Die Einflüsse verschiedener Parameter wie Länge, Durchmesserkombination und Material der transsakralen Schraube, Art der zusätzlichen Fixierung sowie Steifigkeit des Knochens sind nicht bekannt.

In einer probabilistischen Finite-Elemente-Studie wurden die Eingabeparameter zufällig variiert. Berechnet wurden die Rotationswinkel und die Axialkräfte in den verschiedenen Implantaten für 4 verschiedene Lastfälle. In einer anschließenden Sensitivitätsanalyse wurden die Einflüsse der einzelnen Eingabeparameter auf die Ergebnisvariation berechnet. Durch die transsakrale Schraube wird die Beweglichkeit im behandelten Segment deutlich reduziert, außer bei der axialen Rotation. Eine zusätzliche Fixierung hat einen großen Einfluss auf die Variation der Rotation. Die anderen Parameter erklären üblicherweise weniger als 10% der Ergebnisstreuung.

Das lumbosakrale Fusionssystem erlaubt eine gute Stabilisierung des Segments, besonders in Verbindung mit einer zusätzlichen Fixierung.

Abstract

The novel transsacral fusion system AxiALIF allows stabilization of the lumbosacral junction. The system consists of a screw with two different diameters. With additional facet screws or internal fixation devices 360° fusion can be achieved. The effects of different parameters such as length, diameter combination and material of the transsacral screw, type of additional fixation and stiffness of the bone are unknown.

In a probabilistic finite element analysis, the input parameters were randomly varied. The rotational angles and the axial forces in the various implants were calculated for four different load scenarios. In a subsequent sensitivity study the influences of single input parameters on the variance of the results were calculated. A transsacral screw significantly reduces the motion in the treated segment, except for axial rotation. An additional fixation has a strong effect on the variance of rotation angles. The other parameters usually explain less than 10% of the variance.

The novel lumbosacral fusion system allows good stabilization of the segment, especially when additional fixation via facet screws or fixators is performed.

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Interessenkonflikt

Die Studie wurde von der Deutschen Forschungsgemeinschaft (Ro 581) unterstützt. Es bestehen keine Interessenkonflikte.

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Affiliations

  1. Julius-Wolff-Institut, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353, Berlin, Deutschland

    H.N. Boustani,  A. Rohlmann, O. Abouezzeddine, G. Bergmann & T. Zander

Authors
  1. H.N. Boustani
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  2. A. Rohlmann
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  3. O. Abouezzeddine
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  4. G. Bergmann
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  5. T. Zander
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Correspondence to A. Rohlmann.

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Boustani, H., Rohlmann, A., Abouezzeddine, O. et al. Versteifungseinfluss eines transsakralen Fusionssystems. Orthopäde 40, 162–168 (2011). https://doi.org/10.1007/s00132-010-1716-z

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  • DOI: https://doi.org/10.1007/s00132-010-1716-z

Schlüsselwörter

  • AxiALIF
  • Finite-Elemente-Analyse
  • Probabilistikstudie
  • Sensitivitätsstudie
  • Lumbosakrale Wirbelsäule

Keywords

  • AxiALIF
  • Finite element analysis
  • Probabilistic study
  • Sensitivity study
  • Lumbosacral spine