A Noninvasive Anthropometric Technique for Measuring Kyphosis and Lordosis

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Abstract
Cross-sectional measurement of the sagittal geometry of adolescent idiopathic scoliosis patients. To evaluate the accuracy of a noninvasive anthropometric approach for the measurement of kyphosis and lordosis. Noninvasive approaches were developed to estimate the sagittal curvatures of the spine. However, the magnitude of the estimation error could be high for an important proportion of patients, which leads to a difficult clinical application. The group was composed of 124 female patients with a mean age of 13.5 years (SD 2.7 years) with Cobb angles ranging from 4° to 66°. Kyphosis and lordosis were measured on the lateral radiograph. The spine sagittal curvature of the same patients was also estimated using the spatial localization of skin markers placed overlying the spinous processes. These coordinates served as input into a simple trigonometric model. Data were collected by means of a stereovideographic technique (Motion Analysis Corp., Santa Rosa, CA). The intraclass correlation coefficient between both approaches was 0.94 for kyphosis and 0.91 for lordosis; the mean absolute differences were 5° (SD 4°) and 6° (SD 6°), respectively. The difference was less than 10° in 91% of the patients for kyphosis, and in 79% for lordosis. The proposed technique appears to give more representative results than those presented in the literature. It has the advantage of being part of a global noninvasive postural evaluation. Using this approach in a systematic manner could help reduce radiograph exposure while keeping track of the spine sagittal curvatures.