The goniometry is the measurement of the angles created by the intersection of the longitudinal axes of the bones in the articulations. Among its uses, its application to describe alterations in the alignment of the osteoarticular system stands out. Photogrammetry is considered the gold standard for measuring movement, however, its use is complex and have a high cost. An alternative to these systems are the inertial sensors, which use different technologies to record the movement, without the restrictions of the most elaborate systems. Objective: To determine the reliability of inertial sensors in the measurement of cervical kinematics in comparison with photogrammetry. Material and Methods: Active movement was measured in 8 people without pathology using photogrammetry and inertial sensors simultaneously. The procedure was developed by trained professionals in each system. Authorization was obtained from the institutional research committee and informed consent prior to the study. Results and interpretation: An excellent correlation (ICC = 0.936) was observed between both measurement instruments when analyzing all cervical kinematics data. Individually, the sagittal plane presents the best correlation results (ICC = 0.846), followed by the transverse plane (ICC = 0.514) and finally the frontal plane (ICC = 0.095). Conclusions: The results show that inertial sensors represent a viable alternative for the evaluation of joint kinematics. An excellent global correlation with the gold standard was found. Future studies should improve the evaluation procedure with inertial sensors to increase the reliability of the measurement in the planes individually.

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