A Preliminary Investigation to Establish the Criterion Validity of a Qualitative Scoring System of Limb Alignment during Single Leg Squat and Landing

Objective: The present study aimed to investigate the criterion validity of a novel qualitative assessment scheme to assess limb alignment during single leg loading activities. Design and setting: Observational laboratory study Main outcome measures: Performance of 5 participant’s single leg squat and hop landing was assessed using 3-D motion capture and the findings of this compared to the qualitative scoring scheme. Results: The range of percentage of agreement between the qualitative and 3-D score was for all subjects across both tasks 95.6100%. The kappa measure of agreement was k = 0.9 for hop landing and k = 0.97 for single leg squat. Conclusion: The scores generated by the qualitative scoring scheme used showed excellent association with the corresponding data from 3-D motion capture, implying the measurement tool shows criterion validity.

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