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Biomechanical Study of Vertebroplasty by Finite Element Analysis
Sang-Don Kim, M.D.1, Seung-Hoon You, M.D.1, Seong-Rim Kim, M.D.1, Ik-Seong Park, M.D.1,Min-Woo Baik, M.D.1, Jung-Yul Park, M.D.2, and Jung-Keun Suh, M.D.2
Department of Neurosurgery, Holy Family Hospital, College of Medicine, The Catholic University, Bucheon, Korea1 Department of Neurosurgery, College of Medicine, Korea University, Korea2
유한요소 모델링을 통한 척추성형술의 생체역학적 연구
김상돈1ㆍ유승훈1ㆍ김성림1ㆍ박익성1ㆍ백민우1ㆍ박정율2ㆍ서중근2
가톨릭의과대학 부천성가병원 신경외과학교실1, 고려대학교 의과대학 신경외과학교실2
Abstract
Objective
The biomechanical property of vertebroplasty has been investigated by experimental study with its own limitation. In addition, previous works with finite element analysis show many drawbacks in their simplified models geometry of vertebral body and with material properties of bone. This study is to provide the optimal distribution of bone cement to restore strength and stiffness of damaged bone after vertebroplasty using the three dimensional finite element analysis.
Materials and Methods
The finite element modeling of the T12 vertebral body was generated using MEDISURF, IMAGEWARE SURFACER and I-deas softwares. They were classified into two models by location of bone cements. One mode had a bone cement located at center of vertebral body and another one located at both sides. After the specimens were loaded in uniaxial compression and analyzed by ABAQUS software, the results were compared to normal and osteoporotic patients' models.
Results
The displacement of vertebral body of patient was 0.33mm, compared to 0.15mm for vertebral body with central located bone cement and 0.24mm for both-side located one. Less compressive stress on central located model than both-sided located one was also revealed by finite element analysis.
Conclusion
The finite element analysis enabled parameters such as cement volume and distribution to be controlled in a manner that would not be possible with experimental or animal models and model itself was highly anatomically detailed, with geometric and material properties derived from CT scan. And, this biomechanical study showed that a single central distribution of bone cement might be more effective than bilateral one.
Keywords: VertebroplastyㆍFinite element analysisㆍBiomechanical studyㆍCompression fracture


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