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Three-dimensional reconstructions of Lenke 1A curves

机译：Lenke 1A曲线的三维重建

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Background Scoliosis is a 3D deformity that can be reconstructed through 2D antero-posterior and lateral radiographs, which provide an upper view of the deformed spine as well as regional planes matching all vertebrae of elective plane for each curve. The objective of this study is to explore whether all idiopathic scoliosis classified Lenke 1A have the same 3D representation made with regional planes. Methods All patients treated for idiopathic thoracic scoliosis during the growth period and classified Lenke 1A were included in this study conducted in the pediatric spinal orthopedic department of Centre des Massues. A photogrammetric technique was used to obtain a 3D reconstruction, from regional planes identified on radiographs made with the EOS system. Three regional planes are usually identified in asymptomatic spines: lumbar, dorsal, and cervical—none of them presenting rotation. In the studied group, the number of planes, the rotation, and the limit vertebrae of each plane were looked for. Results Sixty-three patients were included (47 girls and 16 boys, mean age 11.3?years). The Cobb angle was meanly 36.5°. The scoliosis was reconstructed with three regional planes (57%) or four ones (43%, with the thoracic plane divided into two planes). Maximal rotation was found in the thoracic plane, especially when scoliosis was represented with four regional planes. The transition between planes 2 and 3 was mainly located between the fourth and sixth dorsal vertebrae. Conclusion The use of an arbitrary regional plane representation of a 3D shape leads to conclude that there are two types of Lenke 1A scoliosis, which should be taken into account for designing the brace.
机译：背景脊柱侧弯是一种3D畸形，可以通过2D前后和X射线照片进行重建，该X射线可提供变形脊柱的俯视图以及与每个曲线的选择平面的所有椎骨匹配的区域平面。这项研究的目的是探讨是否所有分类为特发性脊柱侧弯的Lenke 1A都具有使用局部平面进行的3D表示。方法在马萨诸塞州中心的儿科脊柱骨科进行的这项研究中，包括所有在生长期间接受过特发性胸椎侧弯治疗并分类为Lenke 1A的患者。摄影测量技术被用于从EOS系统制作的射线照片上确定的区域平面中获得3D重建。通常在无症状的脊椎中识别出三个区域平面：腰椎，背椎和颈椎-它们都不呈现旋转状态。在研究组中，寻找平面数，每个平面的旋转度和极限椎骨。结果纳入患者63例（男47例，男16例，平均年龄11.3岁）。 Cobb角平均为36.5°。用三个区域平面（57％）或四个平面（43％，胸平面分为两个平面）重建脊柱侧弯。在胸平面发现最大旋转，特别是当脊柱侧弯以四个区域平面代表时。平面2和3之间的过渡主要位于第四和第六背椎之间。结论使用3D形状的任意区域平面表示法得出的结论是，Lenke 1A脊柱侧弯有两种类型，在设计支架时应将其考虑在内。

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