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Reliability and validity of a novel Kinect-based software program for measuring a single leg squat.

John Ressman1, Eva Rasmussen-Barr1, Wilhelmus Johannes Andreas Grooten1,2

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Summary

The Qinematic™ system shows poor absolute reliability for individual single leg squat (SLS) assessments but may be useful for group analysis. It can identify knee-over-foot positioning at 6° medial displacement, though its trajectory angle assessment needs reconsideration.

Keywords:
KinectMovement screeningRehabilitationSingle leg squatSports medicine

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Area of Science:

  • Biomechanics
  • Movement Analysis
  • Clinical Assessment

Background:

  • The single leg squat (SLS) is a common clinical screening tool.
  • Current SLS assessment is subjective, lacking objective measures.
  • 3D motion analysis systems are rarely used in daily clinical practice.

Purpose of the Study:

  • To evaluate the test-retest reliability and construct validity of the Kinect-based Qinematic™ system for SLS assessment.
  • To determine the system's ability to identify medial knee displacement angles.
  • To summarize the discriminative capacity of SLS measured by Qinematic™.

Main Methods:

  • A test-retest reliability study with 37 participants was conducted.
  • A construct validity study compared Qinematic™ data with visual assessment of video-recorded SLS.
  • Analysis focused on knee displacement variables during the SLS.

Main Results:

  • Substantial reliability (ICC=0.64-0.69) was found for three variables (left knee down, right knee up/down).
  • Poor absolute reliability (SEM=9.04-10.66) was observed across all variables.
  • Moderate agreement (Kappa=0.45-0.58) existed between Qinematic™ and visual assessments; 6° medial displacement showed best discriminative ability (AUC=0.82).

Conclusions:

  • Qinematic™ demonstrates poor absolute reliability but substantial relative reliability for SLS during descent.
  • The system is not recommended for individual assessment but may be suitable for group-level analysis.
  • Qinematic™ at 6° medial displacement can identify knee-over-foot alignment, but the net trajectory angle requires re-evaluation for assessing medial knee positioning.