Effect of Disc Height and Disc Wedge Angle on Lumbar Spine under Axial Compressive Force
نویسندگان
چکیده
Three-dimensional L4-L5 finite element (FE) models of three disc heights (9.5mm, 11.5mm, and 13.5mm) and three disc wedge angles (5o, 8 o, and 10 o) were developed to investigate their effect on L4-L5 lumbar motion segment under pure axial compressive loading. The FE predictions indicated that the axial disc displacement and the posterior disc bulge increased greatly with an increase in the average disc height, and decreased as the disc wedge angle increased. Maximum axial disc displacement and posterior disc bulge occurred in the disc with disc height of 13.5mm and wedge angle of 5 o under an axial compressive force of 3000N. The effect of disc height and wedge angle on von Mises stress distribution in the superior endplate-vertebra interface was found to be negligible.
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