U Berlemann

Publications (2)1.02 Total impact

• Article: [Stress levels in bones and bone cement in the thoracolumbar spine afer kyphoplasty. Finite element study].

  L M Villarraga Ph D, P A Cripton, A J Bellezza, U Berlemann, S M Kurtz, A A Edidin
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  ABSTRACT: The study quantified the stress levels in treated and untreated vertebral bodies following kyphoplasty. Three-dimensional FE models of treated and untreated T11, T12, L1, and L2 vertebral bodies were evaluated to examine the stress levels within the bone and bone cement. A validated T12-L1 model was used to investigate the effect of kyphoplasty treatment on adjacent vertebral stresses and strains. Using the single vertebral models, bone cement modulus changes had minimal effect on the stresses in the bone or the cement. The presence of bone cement had a minimal effect on the stress magnitudes or distribution in the adjacent T12 vertebra. This study provides quantification of the stress levels in bone cement and bone in vertebral bodies treated with kyphoplasty under in vivo-like loading conditions. The presence of bone cement immediately following kyphoplasty has only a slight effect on the stress magnitudes or distributions in adjacent vertebrae.
  Der Orthopäde 02/2004; 33(1):48-55. · 0.51 Impact Factor
• Article: Knochen und Knochen-Zement-Belastungen in der thorakolumbalen Wirbelsäule nach Kyphoplastik

  L.M. Villarraga, P.A. Cripton, A.J. Bellezza, U. Berlemann, S.M. Kurtz, A.A. Edidin
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  ABSTRACT: Die vorliegende Studie quantifiziert die Belastungen in behandelten sowie unbehandelten Wirbelkrpern nach Kyphoplastik. Es wurden dreidimensionale (3D-) Finite-Element-Modelle humaner Wirbelkrper der Niveaus T11, T12, L1 und L2 zur Analyse der Belastungen innerhalb des Knochens und Knochenzements benutzt. Um den Einfluss einer Kyphoplastik auf den benachbarten Wirbelkrper zu simulieren, wurde ein validiertes Wirbelsulensegment T12-L1 berechnet. Im Modell des einzelnen Wirbelkrpers hatten nderungen des Knochenzementmoduls wenig Einfluss auf die Belastungen des Zements oder Knochens. Die Anwesenheit von Knochenzement hatte wenig Effekt auf die Gre oder Verteilung der Belastungen im benachbarten Wirbelkrper T12.Diese Studie quantifiziert die Belastungen in Knochenzement und Knochen in Wirbelkrpern nach Kyphoplastik unter in-vivo-hnlichen Bedingungen. Die Anwesenheit von Knochenzement scheint einen nur geringen Effekt auf die Belastungen im direkt benachbarten Wirbelkrper zu haben.The study quantified the stress levels in treated and untreated vertebral bodies following kyphoplasty. Three-dimensional FE models of treated and untreated T11, T12, L1, and L2 vertebral bodies were evaluated to examine the stress levels within the bone and bone cement. A validated T12-L1 model was used to investigate the effect of kyphoplasty treatment on adjacent vertebral stresses and strains. Using the single vertebral models, bone cement modulus changes had minimal effect on the stresses in the bone or the cement. The presence of bone cement had a minimal effect on the stress magnitudes or distribution in the adjacent T12 vertebra.This study provides quantification of the stress levels in bone cement and bone in vertebral bodies treated with kyphoplasty under in vivo-like loading conditions. The presence of bone cement immediately following kyphoplasty has only a slight effect on the stress magnitudes or distributions in adjacent vertebrae.
  Der Orthopäde 12/2003; 33(1):48-55. · 0.51 Impact Factor