Imaging Characteristics and Risk Factors of Flatfoot Combined with Idiopathic Scoliosis
Objective Explore the incidence and radiographic features of idiopathic scoliosis(IS)in individuals with flatfoot,and analyze the risk factors for the coexistence of flatfoot and IS.Methods Retrospectively analyze the general characteristics and imaging data of 608 flatfoot patients treated at Wuhan Children's Hospital from October 2021 to March 2023.Calculate the incidence in flatfoot patients with a focus on IS.Employ rank-sum tests to compare the general characteristics and foot imaging parameters between IS and non-IS patients,as well as between IS patients with Cobb angles>20° and≤20°.Use univariate analysis for IS versus non-IS patients and IS patients with Cobb angles>20° versus≤20°,considering hallux valgus angle(HVA),Meary's angle(MA),HVA difference,MA difference,and other indicators.Include P<0.20 indicators in multifactorial Logistic regression analysis to assess risk factors for IS in flatfoot patients and risk factors for Cobb angles>20° in flatfoot patients with IS.Results Among the 608 flatfoot patients,67 cases(11.01%)developed IS.Patients with flatfoot and IS exhibited statistically significant asymmetry in bilateral hallux valgus angles and asymmetry in bilateral foot arches(P<0.05).Patients older than 10 years(OR=2.866,95%CI:1.683-4.881,P<0.001),female patients(OR=1.892,95%CI:1.121-3.193,P=0.017),and flatfoot patients with asymmetrical foot arches(OR=1.194,95%CI:1.023-1.393,P=0.025)had a higher risk of developing IS.In flatfoot patients with IS and Cobb angles>20°,the left foot arch was horizontally lower than in the Cobb angles≤20° group(P=0.019).Conclusion The incidence of idiopathic scoliosis(IS)in individuals with flatfoot might be higher compared to the general population.Patients with flatfoot and IS exhibit bilateral asymmetry in foot morphology,including asymmetry in bilateral hallux valgus angles and asymmetry in bilateral foot arches.Additionally,bilateral foot arch asymmetry is identified as a risk factor for the coexistence of flatfoot and IS.