Consideration of digitization precision when building local coordinate axes for a foot model
Consideration of digitization precision when building local coordinate axes for a foot model
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DOI：
10.1016/j.jbiomech.2009.03.013
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发表时间：
2009-06-19
影响因子：
2.4
通讯作者：
Glasoe, Ward M.
中科院分区：
文献类型：
--
作者：
Brown, Kathryn M.;Bursey, Diane E.;Glasoe, Ward M.
本研究调查了为了将坐标系嵌入足部而数字化的点是否准确地代表了所描述的骨的方向。从9具成人尸体标本中收集了8个完整的数据集。可触及的标志定义了5个节段，包括跟骨、舟骨、内侧楔骨、第一跖骨和拇趾。通过使用Flock of Birds电磁运动跟踪设备，单个检查者对每个节段至少数字化3个点。坐标定义遵循右手法则，左侧数据转换为右侧等效。在X近似向前、Y向上和Z横向投影的位置创建局部轴。矩阵变换计算计算了覆盖骨的表面组织解剖前后数字化的点所构建的坐标之间的角度精度（以度为单位）。将解剖后的情况视为比较的标准。X轴的变化代表额状面坐标的角度精度; Y轴的变化代表横断面坐标的角度精度; Z轴的变化代表矢状面坐标的角度精度。跟骨和舟骨坐标轴平均改变
This study investigated whether points digitized for the purpose of embedding coordinate systems into the foot accurately represented the orientation of the bone described. Eight complete data sets were collected from 9 adult cadaver specimens. Palpable landmarks defined 5 segments to include the calcaneus, navicular, medial cuneiform, first metatarsal, and hallux. With use of the Flock of Birds electromagnetic motion tracking device, a single examiner digitized a minimum of 3 points for each segment. Coordinate definitions followed the right-hand rule, with left-sided data converted to right-sided equivalency. Local axes were created where X projected approximately forward, Y upward, and Z laterally. Matrix transformation computations calculated the angular precision in degrees between coordinates built from points digitized pre- and post-dissection of surface tissues covering bone. The condition of post-dissection was considered the criterion standard for comparison. Change about the X-axis represented the angular precision of the coordinate in the frontal anatomical plane; Y-axis in the transverse plane; Z-axis in the sagittal plane. The calcaneus and navicular coordinate axes changed by an average of