Background

Pelvic incidence is the quantification of the pelvis anatomical shape which has significant effect on the occurrence of various lumbar degenerative diseases. The aim of this study was to measure the in vivo dynamic motion characteristics of the lower lumbar spine in people with different pelvic incidence.

Methods

A total of 55 volunteers were included in the study. The participants were devided into 3 groups (A: pelvic incidence≤40°, B: 40° < pelvic incidence <60° and C: pelvic incidence ≥60°). The L3–S1 vertebrae of each subject was MRI scanned to construct 3D models. The lumbar spine was then imaged using a dual fluoroscopic imaging system as the subject performed physiological position. The 3D vertebral models and the fluoroscopic images were used to reproduce the in vivo vertebral positions along the motion path. The relative translations and rotations of each motion segment were analyzed.

Findings

At the L5-S1 segment, the primary ranges of motion for left-right axial rotation and flexion-extension of the patients with large pelvic incidence (3.28° ± 0.79°, 7.56° ± 1.81°) were significantly larger than normal pelvic incidence (2.61° ± 1.01°, 6.57° ± 2.18°) and small pelvic incidence (2.00° ± 0.60°, 5.83° ± 1.67°).

Interpretation

The anatomic variable pelvic incidence is associated with the ranges of motion in lower lumbar vertebrae, especially in the L4–5 and L5-S1 segments.

中文翻译：

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不同骨盆角度个体下腰椎运动特征：体内生物力学研究

背景

骨盆发病率是骨盆解剖形态的量化指标，对各种腰椎退行性疾病的发生有显着影响。本研究的目的是测量不同骨盆入射角人群下腰椎的体内动态运动特征。

方法

共有 55 名志愿者参与了这项研究。参与者分为3组（A：骨盆倾角≤40°，B：40°<骨盆倾角<60°，C：骨盆倾角≥60°）。对每个受试者的 L3-S1 椎骨进行 MRI 扫描以构建 3D 模型。然后在受试者进行生理姿势时使用双荧光成像系统对腰椎进行成像。3D 椎体模型和透视图像用于再现沿运动路径的体内椎体位置。分析了每个运动段的相对平移和旋转。

发现

在L5-S1节段，骨盆倾角大（3.28°±0.79°、7.56°±1.81°）患者左右轴向旋转和屈伸的主要活动范围明显大于正常骨盆倾角。 2.61° ± 1.01°、6.57° ± 2.18°）和小骨盆入射角（2.00° ± 0.60°、5.83° ± 1.67°）。

解释

解剖学可变的骨盆入射角与下腰椎的活动范围有关，特别是在 L4-5 和 L5-S1 节段。