Normative cervical spine kinematics of a circumduction task |
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Institution: | 1. Medical Informatics Group, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark;2. SMI (Sensory-Motor Interaction), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark;3. Department of Health Science and Technology, Aalborg University, Aalborg, Denmark |
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Abstract: | Neck pain is a prevalent condition and clinical examination techniques are limited and unable to assess out-of-plane motion. Recent works investigating cervical kinematics during neck circumduction (NC), a dynamic 3D task, has shown the ability to discern those with and without neck pain. The purposes of this study were to establish 1) confidence and prediction intervals of head-to-torso kinematics during NC in a healthy cohort, 2) a baseline summative metric to quantify the duration and magnitude of deviations outside the prediction interval, and 3) the reliability of NC. Thirty-nine participants (25.6 ± 6.3 years, 19F/20M) without neck pain completed left and right NC. A two-way smoothing spline analysis of variance was utilized to determine the mean-fitted values and 90% confidence and prediction intervals for NC. A standardized effect size was calculated and aggregated across all axes (Delta RMSD aggregate), as a summative metric of motion quality. Confidence and prediction intervals were comparable for left and right NC and demonstrated excellent reliability. The average sum of the Delta RMSD aggregate was 2.76 ± 0.55 for left NC and 2.74 ± 0.63 for right NC. The results of this study demonstrate the feasibility of utilizing normative intervals of a NC task to assess head-to-torso kinematics. |
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Keywords: | Cervical spine Kinematics Motion analysis Circumduction Confidence interval Prediction interval |
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