In vitro hip testing in the International Society of Biomechanics coordinate system.
In vitro hip testing in the International Society of Biomechanics coordinate system.
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DOI：
10.1016/j.jbiomech.2016.10.036
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发表时间：
2016-12-08
影响因子：
2.4
通讯作者：
Jeffers JRT
中科院分区：
文献类型：
--
作者：
van Arkel RJ;Jeffers JRT
许多创新实验旨在回答有关髋关节生物力学的研究问题，然而许多实验未能定义一个坐标系统。这使得研究之间的比较不可靠，并且是将实验结果外推到临床现实的不必要障碍。本研究的目的是提出一种标本安装方案，该方案在国际生物力学学会（ISB）坐标系中对髋关节标本进行对齐和注册，该坐标系是通过触诊患者身体确定的骨标记来定义的。这将使实验测试和临床步态分析或放射学研究之间的直接比较成为可能。为了代表完整的髋关节，将4个完整的合成全骨盆与8个全长可关节的股骨组装并数字化以定义ISB坐标系。根据我们提出的方案，骨盆标本被一分为二，分为左右半骨盆，股骨在中轴处横切，然后装在骨罐中，代表典型的实验设置。相对于骨罐的力学特征，解剖标志被重新数字化，并计算错位。骨盆和股骨的屈伸、内收、内旋和外旋均小于1.5°；这相当于不到髋部正常活动范围的2.5%。提出的标本安装方案提供了一种简单的方法，在ISB坐标系中对齐体外髋关节标本，从而改进了实验室测试和临床研究之间的比较。提供了工程图纸，以允许其他人复制协议中使用的简单夹具。
Many innovative experiments are designed to answer research questions about hip biomechanics, however many fail to define a coordinate system. This makes comparisons between studies unreliable and is an unnecessary hurdle in extrapolating experimental results to clinical reality. The aim of this study was to present a specimen mounting protocol which aligns and registers hip specimens in the International Society of Biomechanics (ISB) coordinate system, which is defined by bony landmarks that are identified by palpation of the patient׳s body. This would enable direct comparison between experimental testing and clinical gait analysis or radiographic studies. To represent the intact hip, four intact synthetic full-pelves with 8 full-length articulating femora were assembled and digitised to define the ISB coordinate system. Using our proposed protocol, pelvis specimens were bisected into left and right hemi-pelves and femora transected at the mid-shaft, and then mounted in bone pots to represent a typical experimental setup. Anatomical landmarks were re-digitised relative to mechanical features of the bone pots and the misalignment was calculated. The mean misalignment was found to be less than 1.5° flexion/extension, ab/adduction and internal/external rotation for both the pelves and femora; this equates to less than 2.5% of a normal range of hip motion. The proposed specimen mounting protocol provides a simple method to align in vitro hip specimens in the ISB coordinate system which enables improved comparison between laboratory testing and clinical studies. Engineering drawings are provided to allow others to replicate the simple fixtures used in the protocol.