Validity and Intertester Reliability of Cervical Range of Motion Using Inclinometer Measurements

Abstract

Several procedures have been developed for using inclinometers to measure cervical range of motion. The purpose of this study was to evaluate the validity and reliability of three such methods. The subjects were thirty-four practicing physical therapists. Three individuals, who served as models, had their cervical range of motion measured by the thirty-four physical therapists using a single, double, and stabilization inclinometer method. X-ray films were then taken of the models in flexion, extension, and right and left lateral flexion. A computerized axial tomography scan was used for measuring cervical spine rotation. Results indicate that the single and double methods in flexion and single and stabilization methods in flexion were valid. Inclinometer measurements of cervical flexion, extension, lateral flexion, and rotation were found to be reliable for all three methods with ICCs ranging from .89 to .94. Although inclinometry yields consistent results, there validly is questionable. Sources of error were identified and suggestions given for improving validity and reliability of cervical range of motion while using inclinometers.