Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Effect of Bone Cement Volume and Stiffness on Occurrences of Adjacent Vertebral Fractures after Vertebroplasty

  • Kim, Jin-Myung (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Shin, Dong Ah (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Byun, Dong-Hak (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Kim, Hyung-Sun (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Kim, Sohee (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Kim, Hyoung-Ihl (Department of Medical System Engineering and Mechatronics, Gwangju Institute of Science and Technology)
  • Received : 2012.04.04
  • Accepted : 2012.11.22
  • Published : 2012.11.28
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Abstract

Objective : The purpose of this study is to find the optimal stiffness and volume of bone cement and their biomechanical effects on the adjacent vertebrae to determine a better strategy for conducting vertebroplasty. Methods : A three-dimensional finite-element model of a functional spinal unit was developed using computed tomography scans of a normal motion segment, comprising the T11, T12 and L1 vertebrae. Volumes of bone cement, with appropriate mechanical properties, were inserted into the trabecular core of the T12 vertebra. Parametric studies were done by varying the volume and stiffness of the bone cement. Results : When the bone cement filling volume reached 30% of the volume of a vertebral body, the level of stiffness was restored to that of normal bone, and when higher bone cement exceeded 30% of the volume, the result was stiffness in excess of that of normal bone. When the bone cement volume was varied, local stress in the bony structures (cortical shell, trabecular bone and endplate) of each vertebra monotonically increased. Low-modulus bone cement has the effect of reducing strain in the augmented body, but only in cases of relatively high volumes of bone cement (>50%). Furthermore, varying the stiffness of bone cement has a negligible effect on the stress distribution of vertebral bodies. Conclusion : The volume of cement was considered to be the most important determinant in endplate fracture. Changing the stiffness of bone cement has a negligible effect on the stress distribution of vertebral bodies.

Keywords

References

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