Calculation of dynamic spinal ligament deformation.
Calculation of dynamic spinal ligament deformation.
复制标题
动态脊柱韧带变形的计算。
DOI：
10.1080/15389580500412036
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Panjabi,ManoharM
中科院分区：
文献类型：
--
作者：
Ivancic,PaulC;Wang,Jaw-Lin;Panjabi,ManoharM
目的：以前确定脊柱韧带变形的方法包括定制设计的传感器或使用运动学数据的刚体变换的计算方法。本研究的目标是描述一种计算方法，以确定脊柱标本中任意方向韧带的动态变形及其相关误差。方法。利用数字立体摄影、横向中立姿势射线照片和详细的定量解剖学来计算具有椎体运动跟踪标记的脊柱节段中的韧带变形，以开发标记标记和韧带之间的几何关系 附着点。定制夹具由两个标记组成，每个标记有四个标记，用于量化与计算的韧带变形、标记标记平移和标记旋转相关的误差。结果。韧带变形的平均误差取决于运动方向，范围在 0.03 毫米 (SD 0.45 毫米) 和 0.28 毫米 (SD 0.18 毫米) 之间。旗帜标记平移的平均误差范围在 0.02 毫米 (SD 0.14 毫米) 和 0.11 毫米 (SD 0.39 毫米) 之间，旗帜旋转的平均误差范围在 -0.06° (SD 0.17°) 和 0.07° (SD 0.12°) 之间。结论。本技术的精度相当于或大于以前的方法。本技术利用相对成本有效的数字立体摄影术，并且可用于计算换能器应用不易获得的韧带中的应变。该方法对于动态或静态脊柱或其他韧带应变的分析具有广泛的适用性，并且可用于确定椎管和椎间孔变窄和面积减少。
Objective.Previous methods to determine spinal ligament deformation have included either custom-designed transducers or computational methods using rigid body transformation of kinematic data. Goals of the present study were to describe a computational methodology to determine dynamic deformations of an arbitrarily oriented ligament in a spine specimen and its associated errors.Methods.Calculation of ligament deformation in a spinal segment with vertebral motion tracking flags utilized digital stereophotography, lateral neutral posture radiograph, and detailed quantitative anatomy to develop geometrical relationships between flag markers and ligament attachment points. A custom jig, consisting of two flags each with four markers, was constructed to quantify errors associated with computed ligament deformation, flag marker translation, and flag rotation.Results.Average error in ligament deformation was dependent upon motion direction and ranged between 0.03 mm (SD 0.45 mm) and 0.28 mm (SD 0.18 mm). Average error for flag marker translation ranged between 0.02 mm (SD 0.14 mm) and 0.11 mm (SD 0.39 mm), and for flag rotation ranged between -0.06° (SD 0.17°) and 0.07° (SD 0.12°).Conclusions.Accuracy of the present technique was equivalent to or greater than that of previous methods. The present technique utilized relatively cost-effective digital stereophotography, and may be used to calculate strain in ligaments not readily accessible for transducer application. The methodology has wide-spread applicability for analyses of dynamic or static spinal or other ligament strains, and may be used to determine spinal canal and intervertebral foramen narrowing and area reduction.