Validity of a Hand-held Tablet Compared to 3-Dimensional Motion Analysis to Assess Landing Mechanics.


Gabor, Z., Lewis, E., Jackson, J., Alderman, E., King, D., Belyea, B. Ithaca College, Ithaca, NY

Lower extremity landing mechanics have been implicated as a contributing factor in knee pain and injury. Cost effective and clinically accessible methods for evaluating movement mechanics are limited. The identification of valid, reliable, and readily accessible technology to assess lower extremity alignment could be an important tool for clinicians, coaches, and strength and conditioning specialists. Purpose: To examine the validity and reliability of a hand-held tablet and movement analysis application (app) for assessing lower extremity alignment during a drop vertical jump task. Methods: Fourteen healthy college aged students gave their written consent to participate in the study. The subjects performed six drop vertical jumps which were recorded simultaneously using a 3D motion capture system and a hand-held tablet. Angles on the tablet were calculated using a motion analysis app. Frontal and sagittal plane hip and knee angles were measured and compared between both systems. 3D moments were calculated and regression analyses were performed with the hand-held tablet measures. The study was approved by the Ithaca College Human Subjects Review Board. Results: Significant correlations between the tablet and 3D measures ranging from r = .585 (P = .028) to r = .821 (Pr2 = .568, P = .049) and hip external rotation (r2=.545, P = 0.42) moments. Conclusion: Results of this study suggest that a hand-held tablet and app is a valuable and cost-effective tool for physical rehabilitation specialists to analyze movement patterns; however these measures do not represent true 3D joint positions.

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