Abstract：
Spontaneous spinal arthrodesis (SSA) is a phenomenon of spontaneous fusion, and SSA is not rare in posttraumatic thoracolumbar kyphosis (PTK). However, few reports have focused on SSA in patients with PTK. The objective of this study was to investigate the prevalence, features, and predictive factors of SSA in patients with PTK.
In this retrospective study, 70 patients with PTK were included. Data on the clinical and radiologic parameters were obtained and evaluated. According to whether there was SSA or not, patients were divided into an SSA group (n = 45) or a non-SSA group (n = 25). A binary logistic regression analysis was used to identify the predictive factors for SSA.
The incidence of SSA in PTK was 64%. Among 45 patients with PTK with SSA, SSA was present as a solid bridging anterior osteophyte along the vertebral bodies in 11 patients, posterior contiguous bony growth through the facet joints bilaterally in 13 patients, bony formation in both anterior and posterior elements in 18 patients, and direct contiguous bony formation from the injured vertebral body to the adjacent one in 3 patients. Patients with longer disease duration, larger local Cobb angle, and anterior wall height loss (AWHL) ratio of injured vertebral body, and less kyphosis flexibility index were significantly more likely to develop SSA. The parameter of AWHL remained significant in binary logistic regression analysis.
SSA in PTK was common, and the SSA sign presented in various patterns, which might have implications for surgical decisions. AWHL was the independent predictor for SSA.
In this retrospective study, 70 patients with PTK were included. Data on the clinical and radiologic parameters were obtained and evaluated. According to whether there was SSA or not, patients were divided into an SSA group (n = 45) or a non-SSA group (n = 25). A binary logistic regression analysis was used to identify the predictive factors for SSA.
The incidence of SSA in PTK was 64%. Among 45 patients with PTK with SSA, SSA was present as a solid bridging anterior osteophyte along the vertebral bodies in 11 patients, posterior contiguous bony growth through the facet joints bilaterally in 13 patients, bony formation in both anterior and posterior elements in 18 patients, and direct contiguous bony formation from the injured vertebral body to the adjacent one in 3 patients. Patients with longer disease duration, larger local Cobb angle, and anterior wall height loss (AWHL) ratio of injured vertebral body, and less kyphosis flexibility index were significantly more likely to develop SSA. The parameter of AWHL remained significant in binary logistic regression analysis.
SSA in PTK was common, and the SSA sign presented in various patterns, which might have implications for surgical decisions. AWHL was the independent predictor for SSA.
摘要：
目的：自发性脊柱关节固定术（SSA）是一种自发融合现象，SSA在创伤后胸腰椎后凸畸形（PTK）中并不罕见。然而,很少有关于PTK患者SSA的报道.这项研究的目的是调查患病率，PTK患者SSA的特点及预测因素。
方法：在这项回顾性研究中，包括70例PTK患者。获得并评估了临床和放射学参数的数据。根据是否有SSA，患者分为SSA组(n=45)和非SSA组(n=25).使用二元逻辑回归分析来确定SSA的预测因素。
结果：PTK中SSA的发生率为64％。45例PTK伴SSA,在11例中，SSA可以作为沿着椎体的坚固的桥接前骨赘存在。13例通过双侧小关节的后部连续骨生长，18例前后骨形成，3例，从受伤的椎体到相邻的椎体直接连续骨形成。病程较长的患者，损伤椎体局部Cobb角及前壁高度损失率(AWHL)较大,后凸柔韧指数较低的患者发生SSA的可能性显著增加。在二元逻辑回归分析中，AWHL的参数仍然显着。
结论：PTK中的SSA很常见，SSA符号可以以各种模式存在，这可能会对手术决定产生影响。AWHL是SSA的独立预测因子。
方法：在这项回顾性研究中，包括70例PTK患者。获得并评估了临床和放射学参数的数据。根据是否有SSA，患者分为SSA组(n=45)和非SSA组(n=25).使用二元逻辑回归分析来确定SSA的预测因素。
结果：PTK中SSA的发生率为64％。45例PTK伴SSA,在11例中，SSA可以作为沿着椎体的坚固的桥接前骨赘存在。13例通过双侧小关节的后部连续骨生长，18例前后骨形成，3例，从受伤的椎体到相邻的椎体直接连续骨形成。病程较长的患者，损伤椎体局部Cobb角及前壁高度损失率(AWHL)较大,后凸柔韧指数较低的患者发生SSA的可能性显著增加。在二元逻辑回归分析中，AWHL的参数仍然显着。
结论：PTK中的SSA很常见，SSA符号可以以各种模式存在，这可能会对手术决定产生影响。AWHL是SSA的独立预测因子。
