Department of Orthopaedic Surgery, Korea University Guro Hospital, Guro-Gu, 08308, Seoul, Republic of Korea.
Department of Orthopaedic Surgery, Inje University Sanggye Paik Hospital, College of Medicine, Inje University, 1342, Dongil-Ro, Nowon-Gu, Seoul, 01757, Republic of Korea.
Sci Rep. 2020 Jun 22;10(1):10053. doi: 10.1038/s41598-020-66975-x.
Numerous biomechanical studies comparing titanium (Ti) and cobalt-chrome-alloy (CCM) rods are described in the literature. However, there is a dearth of literature comparing the two rod materials in adolescent idiopathic scoliosis (AIS). Therefore, the purpose of this study is to compare the correction rates of Ti and CCM rods in the treatment of AIS with double major curves. We enrolled 45 patients with AIS who underwent surgery between 2009 and 2012. We divided patients into two groups, Group A (n = 29) treated with six-millimeter Ti rods and Group B (n = 16) treated with six-millimeter CCM rods. The rod-derotation maneuver was used for correction. We measured pre- and postoperative indices of coronal alignment (Cobb's angle, coronal balance, T1-tilt, clavicle angle) and sagittal alignment (sagittal vertical axis, thoracic kyphosis, lumbar lordosis). In our study, there were no significant differences between the two groups with respect to demographics or curve characteristics (P > 0.05). In Group A, thoracic and lumbar curvature correction rates were 71.2% and 66.8% respectively, and in Group B they were 71.2% and 73.3%, respectively (P = 0.664 and 0.09). There were no significant differences between the two groups in coronal or sagittal factors (P > 0.05) except for greater postoperative lumbar lordosis in the CCM group (P < 0.001). In conclusion, Ti and CCM rods showed similar correction rates in the sagittal and coronal planes for the surgical correction of AIS with double major curves. Biomechanical studies of Ti and CCM rods in vitro is different in biological condition.
大量的生物力学研究比较了钛（Ti）和钴铬合金（CCM）棒在文献中。然而，在青少年特发性脊柱侧凸（AIS）中比较两种棒材的文献却很少。因此，本研究旨在比较 Ti 和 CCM 棒在治疗双主曲线 AIS 中的矫正率。我们招募了 45 名 2009 年至 2012 年间接受手术的 AIS 患者。我们将患者分为两组，A 组（n=29）使用 6 毫米 Ti 棒，B 组（n=16）使用 6 毫米 CCM 棒。采用棒旋转手法进行矫正。我们测量了冠状面（Cobb 角、冠状平衡、T1 倾斜、锁骨角）和矢状面（矢状垂直轴、胸椎后凸、腰椎前凸）的术前和术后指标。在我们的研究中，两组在人口统计学或曲线特征方面没有显著差异（P>0.05）。在 A 组中，胸椎和腰椎的矫正率分别为 71.2%和 66.8%，在 B 组中，它们分别为 71.2%和 73.3%（P=0.664 和 0.09）。两组在冠状面或矢状面因素方面没有显著差异（P>0.05），除了 CCM 组术后腰椎前凸更大（P<0.001）。总之，Ti 和 CCM 棒在双主曲线 AIS 的手术矫正中，在矢状面和冠状面都表现出相似的矫正率。Ti 和 CCM 棒的体外生物力学研究在生物学条件上是不同的。
