Abstract
A blind, repeated-measure design was employed in the study. A total of 760 videofluoroscopic image sequences from the different ranges of cervical flexion and extension in 38 asymptomatic subjects were digitized. The reliabilities on digital measuring the sequential translations of all segmental levels were in good ranges for both image methods. I. INTRODUCTIONS Numerous studies of spinal evaluation between vertebral segments have indicated the value of standard radiographic technique to examine intervertebral curvature or movement. The abnormal or excessive translations between vertebrae in the sagittal plane are clinically important clues to dysfunction or instability (1). Therefore, the study aimed to determine the reliabilities and clinical application of the geometric midplanes and rotation matrix image methods for digital measuring intervertebral translations of cervical flexion- extension to offer further exploration on biomechanics. II. METHOD
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