New Approach for Estimating the Area Ratio of the Lumbar Disc Hernia to the Spinal Canal

鄔詩貴(J. Shih-Shyn Wu) ； 陳建宏(Jian-Horng Chen) ； 陳文哲(Wen-Jer Chen) ； 張恆雄(Walter H. Chang)

《Journal of Orthopaedic Surgery Taiwan》 15卷2期 (1998/06) Pp. 91-98

並列摘要

The successful rate of conservative treatment for herniated intervertebral disc (HIVD) is somewhere around 80% to 90% within 3 months. The ratio of areas of the disc herniation to the spinal canal has been proved to be able to provide a good positive correlation to the clinical filldings. To make the estimating processes for areas of the spinal canal and disc herniation no more technically difficulty or time consumption, simplified and accurate ways to derive the ratio of the above two areas were studied. In this research, Thelander’s ST-index was evaluated and two new algorithms, C- and W-algorithm, based on the analytical geometry, were proposed. Area measurement was simplified to linear measurements. 136 patients with typical clinical features of HIVD were included IS the discussing objects. The radiographic evaluation of CT scan included the linear measurements in the sagittal and transversal planes and the area measurements for both the hernia and the spinal canal. All data were obtained from computerized digitizing equipment. Based on the regression analysis, the new indices were proved to be more correct and significant results than the ST-index were provided and discussed. The average errors caused by ST-, C-and Walgorithms were 48%,5.7% and 4.3%, respectively. In the Paired t-test, the difference between the W-area and absolute area was insignificant statistically. From this study, the relative size of herniated disc to spinal canal can predict the prognosis of conservative treatment.

並列關鍵字

Area Ratio ； Conservative Treatment ； HIVD