Correlations among standing radiographic and non-radiographic sagittal thoracic kyphosis measures

Seven non-radiographic measurement techniques for sagittal thoracic kyphosis were tested for validity against two radiographic techniques. Non-radiographic measurements were taken with a flexicurve ruler and motion-capture markers. Most measures reported fair-good intraclass correlation coefficients. These seven non-radiographic measurement techniques cannot directly replace radiographic measures, but could be utilized with appropriate consideration of potential errors.