Finite element analysis on the vertebral body and adjacent vertebrae of osteoporotic fractures before and after bone and cement injection

doi:10.3969/j.issn.2095-4344.2013.17.001

Abstract

Abstract:

BACKGROUND: At present, the establishment of finite element model mainly depends on the medical image modeling method, and bone cement injection is the artificial assumptions, while the data before and after treatment used in this study are mainly obtaind through CT scan which have a higher reliability.
OBJECTIVE: To establish the three-dimensional finite element models of osteoporotic lumbar vertebral fracture before and after bone cement injection, and to analyze the stress changes of vertebral body and adjacent vertebrae before and after treatment.
METHODS: A 75-year-old patient with osteoporotic vertebral compression fracture of lumbar was selected and treated by bilateral bone cement injection. Clinical curative effect was good, and 2-year follow-up of the vertebral body and adjacent vertebrae showed there was no new vertebral fracture and partial pain. The three-dimensional finite element model was established according to the preoperative and postoperative CT image data in order to simulate lumbar spine flexion and extension, lateral bending, rotating around movement, and then the stress changes were statistical analyzed under the same state of motion before and after treatment.
RESULTS AND CONCLUSION: We have established three-dimensional finite element model of preoperative and postoperative vertebral compression fracture which had 222 727 units. Cement injection into vertebral body (disease vertebral) could increase the stress of L₂ vertebral body when having the flexion and extension and lateral bending movements (P < 0.05), and had no influence on the stress when having rotating around movement (P > 0.05); the bone cement injection had no influence on the stress of L₁ and L₃ vertebral body (adjacent vertebrae) when having the flexion and extension, lateral bending and rotating around movements (P > 0.05). Small amount of bone cement injection for the treatment of elderly osteoporotic lumbar fracture can increase the strength and stress of the disease vertebrae without changing the stress of the adjacent vertebrae.

Key words: bone and joint implants, spinal implants, osteoporosis, lumbar, fracture, bone cement, adjacent vertebral body, three-dimensional finite element, biomechanics, National Natural Science Foundation

CLC Number:

R318

Qiu Xing, Yang Sheng, Lu Jian-min, Zhao De-wei, Liu Ai-qi, Chen Hua-xing, Yuan Chi, Ren Fu-quan, Lü Xing-fei. Finite element analysis on the vertebral body and adjacent vertebrae of osteoporotic fractures before and after bone and cement injection[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(17): 3041-3048.

Figures/Tables 10

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