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Accuracy and Correlation of the Kinect-Based Semi-Automatic Scoring Method for Measuring Anomalous Head Posture as Compared to the CROM® Device For all axes, although the measurable rates in this study were 100% within 30° angles of the head position, there was a decrease in the rates for a 40° angle of the head position. Recently, the use of electronic AHP measuring devices with head-mounted motion trackers or an infrared head tracker has been reported to achieve more accurate head posture measurements.[13],[14] However, both methods require head-mounted equipment, which risks altering the head posture and restricts its use to adults and compliant children. When the head position of the CROM device indicator showed an angle of 0°, it was set as the 0° head position for the KSSM device. [Extracted from the article]

Objective: To determine the reliability of the Kinect-based semi-automatic scoring method (KSSM) using Kinect for Windows v2 for head posture compared to the cervical range-of-motion (CROM) device., Methods and Analysis: Head positions between -40° and +40° of chin up/down (X), head turn (Y), and lateral tilt (Z) were measured in 10° increments in healthy volunteers. Their head positions were simultaneously measured using the KSSM and CROM. The following four points were analyzed: the success rate of the KSSM, the correlation between the two methods, the comparison of results by 95% limits of agreement (LA), and proportional error at 95% LA., Results: The measurability of the KSSM for all positions within ±30° of the X, Y, and Z axes was 100%. The correlations for both methods were 0.979 (95% CI: 0.967-0.987), 0.985 (0.976-0.991), and 0.988 (0.981-0.993) for the X-, Y-, and Z-axes, respectively. The simple linear regression analysis equations for 95% LA were Y=-0.024X-0.452 for X axes, Y=0.024X-0.363 for Y axes, and Y=-0.045X+0.217 for Z axes (95% confidence interval for each axis: -0.055-0.007, -0.006-0.050, and -0.071-0.018). However, the proportional biases were small because the predictive values of the differences in head positions from -40° to 40° determined by the equations were within ± 5° for chin up/down and within ± 3° for head tilt., Conclusion: Head posture measurements using the KSSM and CROM were found to be similar when used in clinical settings., Competing Interests: The authors declare that they have no conflicts of interest in this study., (© 2022 Yamamoto et al.)