Comparative Study on Three Dimensional Back Surface Deformity of Idiopathic Scoliosis using Integrated Shape Investigation System(ISIS) and Moire Topography

ISIS由Harris和Turner-Smith在Oxford Orthop开发。自1987年11月以来，我们利用FM-40与Moire地形图进行比较，研究特发性脊柱侧凸的背部形状分析与畸形进展的关系。虽然随访时间较短（平均仅7个月），但在此时获得了以下结果：1）在39例未经治疗的特发性脊柱侧凸弯曲中，有29例的LAI（侧向不对称指数）与Cobb角的相关系数在胸椎为0.75，在胸腰椎为0.65。2)在20个弯曲中的15个中，对畸形的进展进行了横向不对称指数和Cobb角的比较研究。以Cobb角为7 °、LAI为7点为进展，假阴性率为10%，假阳性率为5%。3)在支具治疗的情况下，发现这种差异大大增加，假阳性率为21%，falseneg。16%。4)根据对曲率为15度及以上的患者的驼峰高度的莫尔地形测量，在X线检查前研究了预测进展的概率，如下所示;真阳性8.1%，真阴性70.9%，假阴性2.4%，假阳性18.8讨论：在随访研究中，通过对ISIS图像和云纹地形图的分析，可以在一定程度上推测特发性脊柱侧凸的进展。应进一步研究这些表面成像技术的有效组合，以减少X线检查。

The ISIS developed by Harris and Turner-Smith in Oxford Orthop. Engineering Centre was investigated since Nov. 1987 comparing with Moire Topography using FM-40 for study on back shape analysis of idiopathic scoliosis concerning progression of the deformity. Following results were obtained at this time of moment, though a duration of follow-up period was short (averaged only for 7 months).1) In 29 of 39 curvatures of idiopatbic scoliosis, where no treatment has been given, a correlation co-efficient between LAI (Lateral Asymmetry Index) and Cobb angle showed 0.75 in thoracic and 0.65 in thoracolumbar curvatures. 2) In 15 of 20 curvatures a comparative study on progression of the deformity was done for Lateral Asymmetry Index and Cobb angle. On the premise that 7 degrees in Cobb angle and 7 points in LAI as progression, a false negative was found in 10% and a false positive in 5 %. 3) In cases of brace treatment this discrepancy was found to be much increased, as false positive in 21%, falseneg. in 16%. 4) Based on the moire topography measurement for hump height in patients with curvature of 15 degrees and more, probability of predicted progression was studied before X-ray examination as follows; true positive in 8.1%, true negative in 70.9%, false negative in 2.4% and false positive in 18.8% (16 patients) respectively, regarding 7 degrees Cobb angle and 4mm hump heigh as progression.Discussion; It was suggested that in follow-up study of idiopathic scoliosis progression can be presumed to a certain extent by analyzing the image of ISIS and moire topography. Further study of effective combination of these surface image technique should be required to reduce X-ray examinations.