特发性脊柱侧凸脊柱对轴向循环载荷的动态响应。
Dynamic response of the idiopathic scoliotic spine to axial cyclic loads.
机构信息
Department of Orthopaedic Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China.
出版信息
Spine (Phila Pa 1976). 2011 Apr 1;36(7):521-8. doi: 10.1097/BRS.0b013e3181d55fb0.
STUDY DESIGN
Numerical techniques were used to study the vibration response of idiopathic scoliosis patients with single thoracic curve.
OBJECTIVE
To analyze the dynamic characteristics of the idiopathic scoliotic spine under the whole-body vibration condition. The influence of the upper body mass was also studied.
SUMMARY OF BACKGROUND DATA
The relationship between the whole-body vibration and the spinal disorders has been investigated using finite element method. However, the dynamic response features of the scoliotic spine to the vibration were poorly understood.
METHODS
The resonant frequencies of the scoliotic spine and the effects of the body weight were studied using a finite element model described previously. Modal and harmonic analysis was conducted. The amplitudes of 6 fundamental vertebral movements around the long, coronal and sagittal axis were quantified in the frequency range of 1 to 35 Hz.
RESULTS
The vibration-induced rotation amplitudes of the apex of the thoracic deformity were higher than that of the lumbar segments. The apical vertebrae had the greatest rotation amplitudes at 2 and 8 Hz, and the largest lateral translation amplitudes at 16 Hz. Vibration could cause large lateral flexion amplitudes in the apex of the thoracic deformity. The apical vertebrae had the largest side flexion amplitudes at 6 Hz. Increasing upper body mass could not change resonant frequency of vibration-induced lateral translation and rotation around the long axis of the apical vertebrae.
CONCLUSION
The scoliotic spine is more sensitive to vibration than the normal spine. For a patient with single thoracic curve, long-term whole-body vibration may do more harm to the thoracic deformity than to the lower lumbar segments. Axial cyclic loads applied to an already deformed spine may cause further rotational and scoliotic deformity. The patients with idiopathic scoliosis are more likely to suffer from vibration-induced spinal disorders than those by normal persons.
研究设计
采用数值技术研究特发性胸椎侧凸患者的单一胸椎曲线的振动响应。
目的
分析全身振动条件下特发性脊柱侧凸脊柱的动态特性。还研究了上半身质量的影响。
背景资料总结
已经使用有限元法研究了全身振动与脊柱疾病之间的关系。然而，对脊柱侧凸脊柱对振动的动态响应特征了解甚少。
方法
使用先前描述的有限元模型研究脊柱侧凸脊柱的固有频率和体重的影响。进行模态和谐波分析。在 1 至 35 Hz 的频率范围内量化了围绕长轴、冠状和矢状轴的 6 个基本椎体运动的幅度。
结果
胸椎畸形顶点的振动引起的旋转幅度高于腰椎段。顶点椎体在 2 Hz 和 8 Hz 处具有最大的旋转幅度，在 16 Hz 处具有最大的横向平移幅度。振动会导致胸椎畸形顶点产生较大的横向屈曲幅度。顶点椎体在 6 Hz 处具有最大的侧屈幅度。增加上半身质量不会改变振动引起的顶点椎体沿长轴的横向平移和旋转的共振频率。
结论
脊柱侧凸脊柱比正常脊柱对振动更敏感。对于患有单一胸椎曲线的患者，长期全身振动可能对胸椎畸形造成的伤害比对下腰椎段更大。已经变形的脊柱上施加的轴向循环载荷可能会导致进一步的旋转和脊柱侧凸畸形。特发性脊柱侧凸患者比正常人更容易患振动引起的脊柱疾病。
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