The effect of coordinate system variation on in vivo patellofemoral kinematic measures
The effect of coordinate system variation on in vivo patellofemoral kinematic measures
复制标题
DOI：
10.1016/j.knee.2014.11.006
复制
发表时间：
2015-03-01
期刊：
影响因子：
1.9
通讯作者：
Wilson, David R.
中科院分区：
文献类型：
--
作者：
Kedgley, Angela E.;McWalter, Emily J.;Wilson, David R.
背景：髌骨使用不同的坐标系定义导致难以比较研究之间的运动学结果。这项工作的目的是确定使用一系列坐标系定义来量化髌骨运动学的效果。此外，还确定了髌骨解剖标志数字化的研究者内和研究者间的可重复性。方法：使用二维和三维数字化应用四种不同的髌骨坐标系定义，并使用单个股骨坐标系进行比较。通过让一名研究者在五个不同的场合观察三名受试者的髌骨标志，确定研究者内的变异性。通过让5名参与者在相同的3名受试者身上标记相同的标志来量化研究者间的差异。髌股运动学进行了量化为10名受试者，在6个角度的胫股屈曲，使用MRI.Results：作为髌骨坐标系的变化的结果，高达11.5度的弯曲，5.0度的旋转，和27.3度的倾斜的差异被观察到在合成旋转相同的运动，说明了标准化的坐标系定义的重要性。结论：为了最小化由于可变性而引起的误差，同时仍然保持生理上可感知的运动学角度，基于髌骨上的最内侧点和最外侧点之间的中间屈曲轴和位于髌骨上的最近端点和远端点之间的向上指向的长轴的坐标系，原点在最近端点、远端点、内侧点、和髌骨外侧点。(C)2014爱思唯尔有限公司版权所有。
Background: The use of different coordinate system definitions for the patella leads to difficulties in comparing kinematic results between studies. The purpose of this work was to establish the effect of using a range of coordinate system definitions to quantify patellar kinematics. Additionally, intra- and inter-investigator repeatabilides of the digitization of anatomic landmarks on the patella were determined.Methods: Four different patellar coordinate system definitions were applied using digitisations in two and three dimensions and a single femoral coordinate system was used for comparison. Intra-investigator variability was established by having one investigator digitize the patellar landmarks of three subjects on five separate occasions. Inter-investigator variability was quantified by having five participants digitize the same landmarks on the same three subjects. Patellofemoral kinematics were quantified for ten subjects, at six angles of tibiofemoral flexion, using MRI.Results: As a result of changes in the patellar coordinate system, differences of up to 11.5 degrees in flexion, 5.0 degrees in spin, and 27.3 degrees in tilt were observed in the resultant rotations for the same motion, illustrating the importance of standardizing the coordinate system definition.Conclusions: To minimize errors due to variability while still maintaining physiologically sensible kinematic angles, a coordinate system based upon an intermediate flexion axis between the most medial and lateral points on the patella, and a superiorly-directed long axis located between the most proximal and distal points on the patella, with an origin at the centre of the most proximal, distal, medial, and lateral points on the patella is recommended. (C) 2014 Elsevier B.V. All rights reserved.