中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (9): 1282-1288.doi: 10.3969/j.issn.2095-4344.2016.09.010

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

负重状态对下腰椎椎体间旋转中心的影响

刘佳男1,2,夏 群2,苗 军2,李宏达1,2,魏 冬2,3   

  1. 1天津医科大学研究生院,天津市 300070;2天津市天津医院,天津市 300211;3天津中医药大学研究生院,天津市 300193
  • 收稿日期:2016-01-19 出版日期:2016-02-19 发布日期:2016-02-19
  • 通讯作者: 夏群,主任医师,天津市天津医院,天津市 300211
  • 作者简介:刘佳男,男,1990年生,天津市人,汉族,天津医科大学在读硕士,主要从事脊柱生物力学研究。
  • 基金资助:
    国家自然科学基金资助项目(81572199,81472140)

Effect of weight-bearing activity on the center of rotation in the lower lumbar vertebrae

Liu Jia-nan1, 2, Xia Qun2, Miao Jun2, Li Hong-da1, 2, Wei Dong2, 3   

  1. 1Graduate School of Tianjin Medical University, Tianjin 300070, China; 2Tianjin Hospital, Tianjin 300211, China; 3Graduate School of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
  • Received:2016-01-19 Online:2016-02-19 Published:2016-02-19
  • Contact: Xia Qun, Chief physician, Tianjin Hospital, Tianjin 300211, China
  • About author:Liu Jia-nan, Studying for master’s degree, Graduate School of Tianjin Medical University, Tianjin 300070, China; Tianjin Hospital, Tianjin 300211, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81572199, No. 81472140

摘要:

文章快速阅读:

 

文题释义:
双X射线透视成像系统:即双平面透视影像系统,利用两台相互垂直的C型臂,在受试者进行透视期间同时采集双斜位瞬时X射线图像。

脊柱的旋转中心:腰椎作为人体脊柱重要的负重结构,相对于颈椎和胸椎来说,每一节段都要承载大量负荷并进行复杂多样的运动。旋转中心作为脊柱运动力学研究的一个重要定性指标,能将椎体的位移和角度运动统一起来考虑,以阐释相邻椎体间的运动特征。相较于运动范围等参数,能更直观的发现椎体间运动模式的改变。下腰椎(L4-S1)作为腰椎退行性疾病的高发节段,获得其在不同载荷下的旋转中心变化特点,不仅有助于了解腰椎退变的发生机制,也能对临床治疗方案的选择提供理论依据。  

 

背景:目前的流行病学调查显示,过度的负重运动是导致腰椎退变的重要危险因素之一, 但负重对于正常人腰椎在体运动模式的影响仍不明了。
目的:探索负重状态下正常人屈伸活动时下腰椎椎体间旋转中心的位置变化特点及规律。
方法:招募无腰椎疾患的健康志愿者14例,年龄(25±5)岁。采用双X射线透视影像系统和螺旋CT检查相结合技术,在计算机软件辅助下,从薄层CT扫描获取腰椎L4-5、L5-S1节段三维重建模型,匹配到双X射线透视影像系统捕获的前屈、中立和后伸时腰椎双斜位X射线透视图像上,重现生理载荷及负重状态下腰椎椎体间三维运动状态。在L4-S1相邻椎体上建立三维坐标系,从而获得腰椎椎体间在前屈、后伸及整体屈伸运动中的旋转中心点。
结果与结论:(1)生理载荷下:正常人L4-5节段整体屈伸运动的旋转中心点位于椎体中轴前方约1.0 mm处,L5-S1节段整体屈伸运动的旋转中心点位于椎体中轴前方约0.7 mm处。(2)负重后:两节段屈伸运动的旋转中心点仅向后方轻微移动约0.5 mm,差异无显著性意义。(3)分别计算对比前屈后伸两部分旋转中心点的位置及其移动范围:负重10 kg后L4-5、L5-S1节段旋转中心点的移动范围较无负重时明显增大(P < 0.05),且负重后L5-S1节段前屈部分的旋转中心点位置较无负重时明显向椎体前方偏移 (P < 0.05)。(4)结果提示,负重使正常人旋转中心的运动轨迹异常增大,且腰椎椎体间处于屈曲位时更易受到影响。

关键词: 骨科植入物, 脊柱植入物, 负重, 健康成人, 腰椎, 三维重建模型, 透视, 在体运动, 屈伸活动, 生理载荷, 旋转中心, 瞬时, 国家自然科学基金

Abstract:

BACKGROUND: Epidemiologic reports have indicated that excessive weight-bearing exercise is one of important risk factors for lumbar degeneration, but the effects of weight-bearing activity on normal lumbar motion pattern are still not clear.
OBJECTIVE: To measure the changing characteristics and rules of position at the center of rotation of the lower lumbar spine during a weight-lifting activity of normal person.
METHODS: Fourteen asymptomatic subjects with a mean age of (25±5) years were recruited for this study. The L4-5 and L5-S1 segments of each subject were CT-scanned to construct 3D models using dual X-ray imaging system and spiral CT examination combined technology in the aid of computer software. The physiological load and lumbar spinal 3D motion under the loading condition were reproduced when matching the flexion, neutrality and extension in the dual X-ray imaging system and on dual oblique lumbar X-ray image. Coordinate systems were established at the vertebral body of L4-S1 to obtain the center of rotation during flexion-to-neutral, neutral-to-extension and the full flexion-extension motion.
RESULTS AND CONCLUSION: (1) Under physiological load, the center of rotation of L4-5 of normal person was located about 1.0 mm anterior to the central axis of the vertebral body, and the center of rotation of L5-S1 was located about 0.7 mm anterior to the central axis of the vertebral body. (2) With weight loading, the center of rotation of both two segments shifted backward about 0.5 mm. There was no statistical difference between these two loading conditions. (3) When the center of rotation in flexion and extension was calculated respectively, the moving range of the center of rotation at both L4-5 and L5-S1 became larger due to taking loads of 10 kg (P < 0.05). In flexion, the center of rotation at L5-S1 significantly shifted forward during a weight-lifting activity (P < 0.05). (4) These results confirm that compared with non-weight-bearing condition, the trajectory of the center of rotation was found to be increased when taking loads, especially during the flexion-to-neutral motion.