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Table 2 Correlation and agreement estimates between the Captury and Vicon systems when measuring through range kinematicsa in squats and standing broad jumps

From: Concurrent validity of lower extremity kinematics and jump characteristics captured in pre-school children by a markerless 3D motion capture system

Variable Range of Motion Correlation and Agreement Estimates
Vicon Captury RMC RMSE LLoA MD ULoA
Squats
 Knee Flexion (°) −21.7 to 146.0 −17.1 to 161.2 0.99 6.4 −25.1 −10.8 3.5
 Hip Flexion (°) −10.9 to 111.9 −19.6 to 125.2 0.92 11.4 − 32.9 −0.6 31.8
 Ankle Dorsi Flexion (°) −42.8 to 52.1 − 64.6 to 60.9 0.95 4.3 −13.5 − 1.0 11.5
 Knee Varus (°) −30.4 to 43.5 −28.8 to 20.8 0.28 5.9 −32.5 − 6.7 19.1
 FP Projection Angle (°) − 164.0 to 176.2 − 179.9 to 179.9 0.74 15.7 − 84.1 −5.9 72.3
 FP Knee Angle (°) −10.7 to 29.7 −16.6 to 37.5 0.83 3.7 −9.2 0.7 10.5
 FP Knee Deviation (mm) −34.2 to 146.0 −52.4 to 176.1 0.88 10.6 −33.6 −1.1 31.4
 Knee-Hip SDR (ratio) 0.71 to 3.73 0.42 to 3.89 0.96 0.08 −0.36 0.01 0.38
 Ankle-Hip SDR (ratio) 0.47 to 2.01 0.42 to 1.96 0.88 0.05 −0.26 0.03 0.32
Jumps
 Knee Flexion (°) −17.0 to 136.9 −15.0 to 155.1 0.93 10.4 −26.4 −3.6 19.3
 Hip Flexion (°) −9.1 to 116.9 −16.6 to 141.0 0.77 16.9 −34.1 7.4 49.0
 Ankle Dorsi Flexion (°) −56.9 to 49.5 − 80.3 to 63.5 0.88 11.0 −32.4 3.6 39.6
 FP Projection Angle (°) −176.7 to 177.6 −179.2 to 178.6 0.38 20.3 −66.0 −0.2 66.4
 FP Knee Angle (°) −45.2 to 85.8 −47.7 to 90.7 0.75 6.6 −14.8 0.5 15.8
 FP Knee Deviation (mm) −33.1 to 81.9 − 67.8 to 149.7 0.63 12.6 −45.7 −1.0 43.8
 Knee-Hip SDR (ratio) 0.67 to 3.29 0.42 to 3.71 0.95 0.11 −0.42 0.02 0.45
 Ankle-Hip SDR (ratio) 0.53 to 5.83 0.57 to 6.55 0.98 0.13 −0.46 0.02 0.49
  1. Note: Range of motion values reflects the minimum and maximum values observed across all trials
  2. FP Frontal Plane, SDR Separation Distance Ratio, RMC Repeated Measures Correlation Coefficient, RMSE Root Mean Square Error, LLoA Lower Limit of Agreement, MD Mean Difference, ULoA Upper Limit of Agreement
  3. aThrough range kinematics specifies all points measured throughout the full range of motion
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