摘要
目的比较小型猪上胸椎各节段椎间盘在垂直受压以及5°前屈、后伸、侧弯时椎间盘的压强变化及分布特点。方法取12具小型猪脊柱标本,分为两组(n=6),一组截取T_(1、2)、T_(3、4)、T_(5、6)、T_(7、8)节段椎间盘,另一组截取T_(2、3)、T_(4、5)、T_(6、7)、T_(8、9)节段椎间盘,两组合并即为完整上胸椎数据。应用生物力学试验机及LLW双面型感压纸对各节段椎间盘依次行100、150、200 N载荷,测量垂直载荷以及5°前屈、后伸及侧弯时压强,分析不同载荷及运动条件下各上胸椎椎间盘的压强变化特点。结果与垂直载荷相比,前屈时上胸椎各节段前方纤维环压强呈增大趋势(P<0.05),而后方纤维环压强部分节段无明显改变(P>0.05)或呈增大趋势(P<0.05);后伸时上胸椎各节段前方纤维环压强呈减小趋势(P<0.05),而后方纤维环压强部分节段呈减小趋势(P<0.05)或无明显变化(P>0.05);侧弯时,随载荷增大各节段侧弯凹侧纤维环压强均明显增加(P<0.05)。结论各上胸椎椎间盘的压强分布在不同载荷下具有不同特点,椎体的后侧结构在上胸椎活动及压强分布中起重要作用。上胸椎侧弯时凹侧压强明显增大,表明受力不对称可能是脊柱侧弯进展的重要原因之一;个体体质量是影响脊柱侧弯进展的重要因素。
Objective To analyze the pressure change and distribution of the intervertebral disc of upper thoracic spine in vertical pressure and 5 ° flexion, extension, or lateral bending. Methods Twelve thoracolumbar spinal specimens were harvested from mini pigs and were divided into 2 groups（n= 6）. T_（1、2）、T_（3、4）、T_（5、6）、and T_（7、8） segments were included in one group, and T_（2、3）、T_（4、5）、T_（6、7）、T_（8、9） segments were included in the other group. The data from both groups represented the complete upper thoracic vertebra data. Biomechanical machine and pressure sensitive film were used to measure the pressure on the vertebral columns under loadings of 100, 150, and 200 N in vertical pressures and 5 ° flexion, extension, or lateral bending. The pressure change of each intervertebral disc under different loads and in different movement conditions was analyzed. Results In flexion, the anterior annulus pressure of the upper thoracic vertebra increased（P〈0. 05）, whereas the posterior annulus pressure showed no significant change（P〈0. 05） or an increasing trend（P〈0. 05）. In extension, the anterior annulus pressure of the upper thoracic vertebra decreased（P〈0. 05）, whereas the posterior annulus pressure decreased（P〈0. 05） or had no obvious change（P〈0. 05）. In lateral bending, the pressure on the concave side of the annulus increased significantly（P〈0. 05）. Conclusion The upper thoracic vertebra has unique biomechanical characteristics under different loadings; moreover, the posterior vertebral structure plays an important role in the movement of the upper thoracic vertebral segment and pressure distribution. In lateral bending of the upper thoracic vertebra, the concave side pressure will increase significantly, which suggests that asymmetrical force is an important cause of scoliosis progression. Gravity plays an important role in the progression of scoliosis.
出处
《中国修复重建外科杂志》
CAS
CSCD
北大核心
2016年第8期992-997,共6页
Chinese Journal of Reparative and Reconstructive Surgery
基金
河北省医学科学研究重点课题计划(04096)~~
关键词
脊柱侧弯
上胸椎
生物力学
感压材料
Scoliosis
Upper thoracic spine
Biomechanics
Pressure sensitive material
