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Reproducibility and validity of video screen measurements of gait in children with spastic cerebral palsy.

机译：痉挛性脑瘫患儿步态的视频屏幕测量的可重复性和有效性。

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PURPOSE: To determine the reproducibility and validity of video screen measurement (VSM) of sagittal plane joint angles during gait. METHODS: 17 children with spastic cerebral palsy walked on a 10m walkway. Videos were recorded and 3d-instrumented gait analysis was performed. Two investigators measured six sagittal joint/segment angles (shank, ankle, knee, hip, pelvis, and trunk) using a custom-made software package. The intra- and interrater reproducibility were expressed by the intraclass correlation coefficient (ICC), standard error of measurements (SEM) and smallest detectable difference (SDD). The agreement between VSM and 3d joint angles was illustrated by Bland-Altman plots and limits of agreement (LoA). RESULTS: Regarding the intrarater reproducibility of VSM, the ICC ranged from 0.99 (shank) to 0.58 (trunk), the SEM from 0.81 degrees (shank) to 5.97 degrees (trunk) and the SDD from 1.80 degrees (shank) to 16.55 degrees (trunk). Regarding the interrater reproducibility, the ICC ranged from 0.99 (shank) to 0.48 (trunk), the SEM from 0.70 degrees (shank) to 6.78 degrees (trunk) and the SDD from 1.95 degrees (shank) to 18.8 degrees (trunk). The LoA between VSM and 3d data ranged from 0.4+/-13.4 degrees (knee extension stance) to 12.0+/-14.6 degrees (ankle dorsiflexion swing). CONCLUSION: When performed by the same observer, VSM mostly allows the detection of relevant changes after an intervention. However, VSM angles differ from 3d-IGA and do not reflect the real sagittal joint position, probably due to the additional movements in the other planes.
机译：目的：确定步态时矢状面关节角度的视频屏幕测量（VSM）的可重复性和有效性。方法：17名痉挛性脑瘫患儿在10m的人行道上行走。记录视频并进行3d步态分析。两名研究人员使用定制软件包测量了六个矢状关节/节段角度（小腿，脚踝，膝盖，臀部，骨盆和躯干）。内和间的可重复性由组内相关系数（ICC），测量标准误差（SEM）和最小可检测差异（SDD）表示。 VSM和3d关节角之间的一致性通过Bland-Altman图和一致性极限（LoA）进行了说明。结果：关于VSM的评估者内重现性，ICC范围从0.99（直柄）到0.58（直柄），SEM范围从0.81度（直柄）到5.97度（直柄），而SDD从1.80度（直柄）到16.55度（树干）。关于界面间的可重复性，ICC范围从0.99（直柄）到0.48（直柄），SEM的范围是0.70度（直柄）到6.78度（直柄），SDD从1.95度（直柄）到18.8度（直柄）。 VSM和3d数据之间的LoA在0.4 +/- 13.4度（伸膝姿势）到12.0 +/- 14.6度（踝背屈摆动）之间。结论：当由同一观察者执行时，VSM通常允许在干预后检测相关变化。但是，VSM角度不同于3d-IGA，并且不能反映实际的矢状关节位置，这可能是由于其他平面中的其他运动所致。

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