Application Value of Combined Diagnosis of Ultrasound, MRI, and X-Ray in Developmental Dysplasia of the Hip in Children

OBJECTIVE: To explore the application value of the combined diagnosis of ultrasound, MRI, and X-ray in developmental dysplasia of the hip (DDH) in children. METHODS: Ninety children with suspected DDH admitted to our hospital from June 2017 to June 2020 were selected as the research objects to conduct a retrospective study. According to the age of the children, they were divided into a group with 0–6 months (group X), a group with 7–12 months (group Y), and a group older than 12 months (group Z), with 30 cases in each group. X-ray and high-frequency ultrasound were performed in all groups, and MRI examination was added to the children in groups Y and Z to compare the diagnostic value of the three imaging examinations in DDH children. RESULTS: No obvious differences in the general data and maternal risk factors were observed among the three groups (P < 0.05). The final comprehensive diagnostic results were taken as the gold standard, including 23 cases with acetabular dysplasia, 28 cases with subluxation of the femoral head, 31 cases with complete dislocation of the femoral head, and 8 non-DDH cases. The diagnostic accuracy of the three methods from high to low was MRI, high-frequency ultrasound, and X-ray, with obviously higher diagnostic accuracy of MRI than that of X-ray (P < 0.05). The ROC curves showed that the diagnostic efficacy from high to low was MRI + high-frequency ultrasound + X-ray, high-frequency ultrasound + X-ray, MRI, high-frequency ultrasound, and X-ray. CONCLUSION: Ultrasound combined with X-ray has obvious advantages in the diagnosis of children at low months of age, while MRI has outstanding advantages in the diagnosis of children at high months of age. MRI combined with ultrasound and X-ray can significantly improve the diagnostic accuracy of DDH and provide objective data support for the clinical treatment of children.