Numerical and experimental analysis of biomechanics of three lumbar vertebrae

• Autorzy: Antosik T. , Awrejcewicz J.
• Języki publikacji: EN

Abstrakty

EN

A three-dimensional numerical model of the human spine including three vertebrae of the lumbar spine (L1, L2, L3) has been built using the ANSYS 5.2 FEM program. Mechanical properties of different elements of the spine have been taken into account, i.e., cortical bone, cancellous bone, posterior elements, etc., in the model. The model allows one to analyse spine displacement under various static and dynamical loads acting on the vertebral structure, as well as it enables one to select proper implants. For verification purposes, the numerical analysis results having the form of displacements under different loads have been compared with the in-vitro experiment results obtained by other authors. In addition, a test stand allowing for experimental investigation of displacements of different elements of the spine has been constructed. In the investigation into stiffness, the artificial vertebrae L1, L2, L3 have been used. A good agreement between tje results obtained from the numerical analysis and experiments has been achieved.

PL

Wykorzystując komercyjny program ANSYS 5.2 oparty na MES, stworzono trójwymiarowy model numeryczny kręgosłupa ludzkiego składający się z trzech kręgów lędźwiowych (L1, L2, L3). W modelu uwzględniono własności mechaniczne poszczególnych elementów kręgosłupa (kość korowa, gąbczasta, wyrostki, pierścienie włókniste, jądro). Model ten pozwala na analizowanie przemieszczeń zachodzących w układzie kręgosłupa pod wpływem różnych obciążeń statycznych i dynamicznych oraz umożliwia badanie i dobieranie różnego rodzaju implantów. W celu zweryfikowania modelu numerycznego porównano otrzymane wyniki w postaci przemieszczeń, uzyskane pod wpływem różnego rodzaju obciążeń, z wynikami uzyskanymi przez różnych autorów w testach biomechanicznych na preparatach biologicznych in-vitro. Okazało się, że wyniki te są w dużym stopniu zbieżne. W celu dodatkowej weryfikacji stworzonego modelu numerycznego zostało zaprojektowane i wykonane stanowisko umożliwiające badanie in-vitro przemieszczeń fragmentu kręgosłupa ludzkiego. W badaniach stabilności wykorzystano sztuczny model kręgów L1, L2, L3. Wyniki, które uzyskano w modelowaniu numerycznym są bardzo zbliżone do wyników uzyskanych podczas testów na tym stanowisku.

Słowa kluczowe

EN

lumbar spine; implant; FEM; in vitro experiments

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 1999
• Tom: nr 3
• Strony: 413--434
• Opis fizyczny: Bibliogr. 54 poz, il., wykr., tab.

Twórcy

autor

Antosik T.

• Division of Automatic and Biomechanics, Technical University of Łódź

autor

Awrejcewicz J.

• Division of Automatic and Biomechanics, Technical University of Łódź

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