McGarry T, McHugh B, Buis A, McKay G
National Centre for Training and Education in Prosthetics and Orthotics, University of Strathclyde, Glasgow, Scotland, UK.
Prosthet Orthot Int. 2008 Jun;32(2):145-54. doi: 10.1080/03093640802015920.
The TracerCAD system is one of the leading prosthetic CAD systems in the world and is increasingly used in clinics to replace traditional methods of residual limb shape capture. Accurate dimensional capture of the residuum is arguably the most important process in the production of a prosthetic socket. TracerCAD system accuracy has previously been tested on a cylindrical model but not a trans-tibial shape. Residual limbs are irregular in shape therefore it is important to assess if shape has an effect on the accuracy of data collected when using TracerCAD. The objective of this study is to investigate the accuracy of the TracerCAD system in measuring a model of a trans-tibial stump of known dimensions and volume. A model of a trans-tibial stump was produced and filled with plaster and measured using a data acquisition system with an accuracy of five micron (0.005 mm). The model was repeatedly traced using the TracerCAD system by an individual user. The mean value of measures taken by the dynamic indicator was calculated and compared to individual and mean values of TracerCAD measurement. Results showed that the TracerCAD measurement was not as consistent on the more complex trans-tibial model as for the cylindrical model.
TracerCAD系统是世界领先的假肢计算机辅助设计（CAD）系统之一，在临床中越来越多地用于取代传统的残肢形状采集方法。残肢的精确尺寸采集可以说是假肢接受腔生产中最重要的过程。TracerCAD系统的精度此前已在圆柱形模型上进行过测试，但未在经胫骨形状上进行测试。残肢形状不规则，因此评估形状是否会对使用TracerCAD时收集的数据准确性产生影响很重要。本研究的目的是调查TracerCAD系统在测量已知尺寸和体积的经胫骨残端模型时的准确性。制作了一个经胫骨残端模型，用石膏填充，并使用精度为5微米（0.005毫米）的数据采集系统进行测量。该模型由一名用户使用TracerCAD系统反复进行扫描。计算动态指示器所测值的平均值，并与TracerCAD测量的个体值和平均值进行比较。结果表明，TracerCAD测量在更复杂的经胫骨模型上不如在圆柱形模型上那样一致。
