摘要
目的:比较分析T12、L1脊柱椎体下表面在纵向压缩载荷下的应力分布及变化趋势,为胸腰段脊柱后凸畸形患者的治疗及康复提供生物力学依据。方法:通过新鲜脊柱标本CT扫描影像建立正常的T10-L2段脊柱三维计算机模型,再通过自由造型系统重建脊柱后凸畸形15°模型。对两种模型均施加纵向800N压缩载荷,比较分析T12、L1椎体下表面的应力分布及变化趋势。结果:正常T12、L1椎体在承受纵向压缩载荷时,主要载荷集中在椎体后部以及脊柱的后部结构;后凸畸形T12、L1脊柱主要靠椎体承受纵向压缩载荷,且载荷主要集中于椎体前部。结论:在纵向压缩载荷下,正常脊柱T12-L1段椎体后部容易损伤和骨折,后凸脊柱T12-L1段椎体前部容易损伤和骨折。
Objective:To comparatively analyze the attribution and changeable tendency of stress on the lower surface of T12and L1under axial compressive load in order to provide biomechanical foundation for treatment and rehabilitation of patient with thoracolumbar kyphosis.Method:A3D finite element model of normal segment from T10to L2was reconstructed by CT sectional images from thoracolumbar spine of fresh cadaver.A kyphosis model of15°was reconstructed also by the freeform system.The attribution and changeable tendency of stress on the lower surface of T12and L1under axial compressive load of800N in the two models were comparatively analysed.Result:The stress concentrated on the posterior area and structures of the bodies and vertebrae when axial compressive load was applied to the normal model.Whereas the stress concentrated on the anterior area of the bodies when axial compressive load was applied to the kyphosis model.Conclusion:Fracture and lesion are more common in the posterior area and structures of the bodies and vertebrae when axial compressive load was applied to the normal model of T12and L1,and fracture and lesion are more common in anterior area of the bodies when axial compressive load is applied to the kyphosis model of T12and L1.
出处
《中国康复医学杂志》
CAS
CSCD
2003年第11期653-655,共3页
Chinese Journal of Rehabilitation Medicine
基金
国家高技术研究发展(863)计划(2001AA231031
2002AA231021)
国家自然科学基金课题(30171184)
