Directorate of Sport, Exercise and Physiotherapy, Dept. of School of Health, University of Salford, Salford, UK.
J Sport Rehabil. 2012 Feb;21(1):7-11. doi: 10.1123/jsr.21.1.7. Epub 2011 Nov 15.
Two-dimensional (2D) video analysis of frontal-plane dynamic knee valgus during common athletic screening tasks has been purported to identify individuals who may be at high risk of suffering knee injuries such as anterior cruciate ligament tear or patellofemoral pain syndrome. Although the validity of 2D video analysis has been studied, the associated reliability and measurement error have not.
To assess the reliability and associated measurement error of a 2D video analysis of lower limb dynamic valgus.
Reliability study.
20 recreationally active university students (10 women age 21.5 ± 2.3 y, height 170.1 ± 6.1 cm, weight 66.2 ± 10.2 kg, and 10 men age 22.6 ± 3.1 y, height 177.9 ± 6.0 cm, weight 75.8 ± 7.9 kg).
Within-day and between-days reliability and measurement-error values of 2D frontal-plane projection angle (FPPA) during common screening tasks.
Participants performed single-leg squat and drop jump and single-leg landings from a standard 28-cm step with standard 2D digital video camera assessment.
Women demonstrated significantly higher FPPA in all tests except the left single-leg squat. Within-day ICCs showed good reliability and ranged from .59 to .88, and between-days ICCs were good to excellent, ranging from .72 to .91. Standard error of measurement and smallest detectable difference values ranged from 2.72° to 3.01° and 7.54° to 8.93°, respectively.
2D FPPA has previously been shown to be valid and has now also been shown to be a reliable measure of lower extremity dynamic knee valgus. Using the measurement error values presented along with previously published normative data, clinicians can now make informed judgments about individual performance and changes in performance resulting from interventions.
二维（2D）视频分析常用于分析在常见运动筛查任务中膝关节的额状面动态外展，其目的是识别可能存在膝关节损伤高风险的个体，例如前交叉韧带撕裂或髌股疼痛综合征。虽然二维视频分析的有效性已经过研究，但相关的可靠性和测量误差尚未得到研究。
评估下肢动态外展的 2D 视频分析的可靠性和相关测量误差。
可靠性研究。
20 名有运动习惯的大学生（10 名女性，年龄 21.5±2.3 岁，身高 170.1±6.1cm，体重 66.2±10.2kg；10 名男性，年龄 22.6±3.1 岁，身高 177.9±6.0cm，体重 75.8±7.9kg）。
在常见筛查任务中，2D 额状面投影角（FPPA）的日内和日间可靠性和测量误差值。
参与者进行单腿深蹲和跳落以及从标准 28cm 台阶上的单腿落地测试，采用标准的 2D 数字视频相机评估。
女性在所有测试中除了左腿单腿深蹲外，FPPA 都显著更高。日内 ICC 显示出良好的可靠性，范围为.59 至.88，日间 ICC 则为良好至优秀，范围为.72 至.91。测量误差和最小可检测差异值分别为 2.72°至 3.01°和 7.54°至 8.93°。
2D FPPA 之前已被证明具有有效性，现在也已被证明是下肢动态膝关节外展的可靠测量方法。使用本文提出的测量误差值以及之前发表的正常数据，临床医生现在可以根据个体表现和干预后的表现变化做出明智的判断。
