Abstract

Purpose

The purposes of this study were to analyse the correlations between the inflection point (IP) and spinal sagittal parameters and to establish the corresponding linear regressions in asymptomatic adults.

Methods

A total of 205 asymptomatic subjects older than 18 years were recruited between April 2017 and September 2019. A full-spine, standing X-ray was collected for each subject. The following parameters were documented: the IP, the apices of thoracic kyphosis (TKA) and lumbar lordosis (LLA), the distance between the plumb line of the thoracic apex (TAPL) or lumbar apex (LAPL) and gravity plumb line, thoracic kyphosis (TK), lumbar lordosis (LL) and the upper arc and the lower arc of lumbar lordosis (LLUA and LLLA, respectively). The correlations between the IP and the above parameters and between the thoracic and lumbar parameters were analysed. The level of significance was P < 0.05.

Results

The IP was statistically correlated with age (r_s = 0.327), the TKA (r_s = 0.639), the TAPL (r_s = 0.338), TK (r_s = 0.391), the LLA (r_s = 0.545), the LAPL (r_s = − 0.383), the LLUA (r_s = 0.371) and the LLLA (r_s = − 0.145) but was not linked with LL (r_s = 0.118). In addition, there were relationships between the TKA and LLA (r_s = 0.397), the TAPL and LAPL (r_s = − 0.357), TK and LL (r_s = 0.529), TK and the LLUA (r_s = 0.742) and TK and the LLLA (r_s = 0.148).

Conclusion

The IP was significantly related to spinal sagittal alignment in asymptomatic adults. Moreover, predictive formulae for sagittal parameters as a function of the IP were developed, which are helpful for surgeons in comprehending the regulatory mechanisms of spinal sagittal alignment and designing an ideal therapeutic plan.

Graphic abstract

These slides can be retrieved under Electronic Supplementary Material.

中文翻译：

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无症状成人中拐点与脊柱矢状位之间的相关性。

摘要

目的

这项研究的目的是分析拐点（IP）与脊柱矢状面参数之间的相关性，并建立无症状成人的相应线性回归。

方法

在2017年4月至2019年9月之间，共招募了205名18岁以上的无症状受试者。为每位受试者收集了全脊柱站立X射线。记录了以下参数：IP，胸椎后凸畸形（TKA）和腰椎前凸（LLA），胸廓垂线（TAPL）或腰椎垂线（LAPL）与重力垂线之间的距离，胸椎后凸（TK），腰椎前凸（LL）以及腰椎前凸的上弧和下弧（分别为LLUA和LLLA）。分析了IP与以上参数之间的相关性以及胸，腰参数之间的相关性。显着性水平为P  <0.05。

结果

IP与年龄（r _s  = 0.327），TKA（r _s  = 0.639），TAPL（r _s  = 0.338），TK（r _s  = 0.391），LLA（r _s  = 0.545）， LAPL（r _s  = − 0.383），LLUA（r _s  = 0.371）和LLLA（r _s  = − 0.145）与LL（r _s  = 0.118）没有联系。此外，TKA和LLA（r _s  = 0.397），TAPL和LAPL（r _s  = − 0.357），TK和LL（r _s）之间存在关系_。 = 0.529），TK和LLUA（r _s  = 0.742），TK和LLLA（r _s  = 0.148）。

结论

该IP与无症状成人的脊柱矢状位明显相关。此外，针对矢状面参数作为IP的函数的预测公式已被开发出来，这有助于外科医生理解脊柱矢状面对准的调节机制并设计理想的治疗方案。

图形摘要

这些幻灯片可以在电子补充材料下找到。