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Reliability of video-based quantification of the knee- and hip angle at foot strike during running.   

Authors:  Damsted C, Nielsen RO, Larsen HL

In clinical practice, joint kinematics during running are primarily quantified by two-dimensional (2D) video recordings and motion-analysis software. The applicability of this approach depends on the clinicians’ ability to quantify kinematics in a reliable manner. The reliability of quantifying knee- and hip angles at foot strike is uninvestigated.  Therefore, the purpose of this study was to investigate the intra- and inter-rater reliability within and between days of clinicians’ ability to quantify the knee- and hip angles at foot strike during running.  Eighteen recreational runners were recorded twice using by a clinical 2D video setup during treadmill running. Two blinded raters quantified joint angles on each video twice with freeware motion analysis software.  The range from the lower prediction limit to the upper prediction limit of the 95% prediction interval varied three to eight degrees (within day) and nine to 14 degrees (between day) for the knee angles. Similarly, the hip angles varied three to seven degrees (within day) and nine to 11 degrees (between day).  The authors concluded that the reliability of quantifications of the knee- and hip angle based on a clinical 2D video setup is acceptable, encouraging clinicians to keep using 2D motion analysis techniques in clinical practice to quantify the knee and hip angles in healthy runners.

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