Abstract:Objective To explore the relationship between serum Dickkopf-1 protein, erythrocyte sedimentation rate (ESR), vascular endothelial growth factor-A (VEGF-A), and the condition and occurrence of spinal fractures in patients with ankylosing spondylitis (AS).Methods Fifty-four AS patients who suffered spinal fractures admitted to the Shenzhen Ping Le Orthopedic Hospital, affiliated with Guangzhou University of Chinese Medicine, from January 2020 to August 2022 were selected as the fracture group, and 70 AS patients without spinal fractures were selected as the control group. The age, gender, course of disease, Dickkopf-1 protein, ESR, VEGF-A, lumbar spine bone density T value, Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI), serum C-reactive protein (CRP), and Schober's test distance were compared between the two groups. Pearson correlation analysis was used to analyze the correlation between Dickkopf-1 protein, ESR, VEGF-A, BASDAI, and BASFI. Multifactorial logistic regression analysis was used to analyze the influencing factors of spinal fractures in AS patients.Results The lumbar spine bone density T value, BASDAI, BASFI, serum CRP, and Schober's test distance were significantly different between the fracture group and the control group (P < 0.05). The levels of Dickkopf-1 protein, ESR, and VEGF-A in the fracture group were higher than those in the control group (P < 0.05). The BASDAI scores of the fracture group patients were positively correlated with Dickkopf-1 protein, ESR, and VEGF-A (r = 0.577, 0.596, and 0.714, respectively, all P = 0.000); the BASFI scores of the fracture group patients were positively correlated with Dickkopf-1 protein, ESR, and VEGF-A (r = 0.502, 0.586, and 0.686, respectively, all P = 0.000). Decreased lumbar spine bone density T value [O^R =1.770(95% CI: 1.150, 2.724)], increased BASDAI score [O^R =1.168(95% CI: 1.008, 1.353)], increased BASFI score [O^R =1.202(95% CI: 1.302, 1.401)], elevated Dickkopf-1 protein [O^R =1.486(95% CI: 1.034, 2.135)], and elevated VEGF-A [O^R =1.857(95% CI: 1.077, 3.202)] were independent risk factors for spinal fractures in AS patients (P < 0.05).Conclusion Levels of Dickkopf-1 protein, VEGF-A, and ESR are associated with the condition of AS patients and closely related to the occurrence of spinal fractures in these patients.