The impact of model assumptions on results of computational mechanics in abdominal aortic aneurysm

Horizontal cut through a three-dimensional reconstructed abdominal aortic aneurysm (Female59) prepared for simulation demonstrates computational grid density of the aneurysm wall and the intraluminal thrombus.

An exemplary illustration shows equilibrium and blood pressure load using a simple cantilever beam. Equilibrium and load are shown (a) with respect to the known reference geometry obtained from imaging (LinGeom and NonOrthPressure) and (b) with respect to the unknown deformed geometry. The pressure load is shown with respect to the reference geometry (NonLinGeom and NonOrthPressure). (c) Equilibrium and true pressure load are shown with respect to the unknown deformed geometry (NonLinGeom and OrthPressure).

Analyzed abdominal aortic aneurysms (AAA) with exemplarily different morphology. Left to right, Sacciform (Male40), fusiforme (Female59), fusiform (Male42), and large fusiforme symptomatic AAA (Male39).

Simulation results for models 1 to 6 for the Male40 abdominal aortic aneurysm (AAA), as described in Table III and in Methods. Left, Color indicates deformation in mm. Center, Color indicates wall stress (von Mises stress; Pa). Right, Coronal cut through AAA where color indicates wall stress (von Mises stress; Pa).

Simulation results for models 1 to 6 for the Female59 abdominal aortic aneurysm, as described in Table III and in Methods. Left, Color indicates deformation in mm. Center, Color indicates wall stress (von Mises stress; Pa). Right, Coronal cut through AAA where color indicates wall stress (von Mises stress; Pa).

Simulation results for models 1 to 6 for the Male39 abdominal aortic aneurysm (AAA), as described in Table III and in Methods. Left, Color indicates deformation in mm. Center, Color indicates wall stress (von Mises stress; Pa). Right, Coronal cut through AAA where color indicates wall stress (von Mises stress; Pa).

Simulation results for models 1 to 7 for the Male42 abdominal aortic aneurysm (AAA) as described in Table III and in Methods. Left, Color indicates deformation in mm. Center, Color indicates wall stress (von Mises stress; Pa). Right, Coronal cut through AAA where color indicates wall stress (von Mises stress; Pa).