2024 Volume 15 Issue 9 Pages 1187-1194
Introduction: The purpose of this study was to verify the reliability of a noninvasive digital camera sagittal vertical axis (SVA) and its relation to X-ray.
Methods: The subjects were six healthy subjects and eight patients with kyphosis. Digital camera SVA was taken in the upright position with markers attached to C7 spinous process and midpoints of superior and posterior iliac spines. The digital camera SVA was then calculated using Image J.
Statistical analysis was performed using intraclass correlation coefficient (ICC) and Spearman's rank correlation coefficient.
Results: For the digital camera SVA "taken from marker attachment" in six healthy subjects, ICC (1,1) = 0.83-0.84 and ICC (2,1) = 0.93-0.97. In eight patients with kyphosis, ICC (1,1) = 0.99 and ICC (2,1) = 0.99, as measured by Image J. The results of the "measurement with Image J" in eight patients with kyphosis showed that ICC (1,1) = 0.99 and ICC (2,1) = 0.99.
A moderate correlation was found between the digital camera SVA and SVA from standing full spine X-ray lateral images (rs = 0.86-0.90).
Conclusions: Digital camera SVA assessment had high intra- and interrater reliability and moderate correlation with X-ray. The digital camera SVA assessment is simple, noninvasive, and can be frequently performed, making the digital camera SVA assessment possible to track changes over time and to determine the effectiveness of physical therapy.
