Objective To explore the MRI features about the annular ligamentinjuries in pediatric patients. Methods The appearance of MRI about annular ligamentinjuries in 15 pediatric patients diagnosed clinically were retrospectively analyzed. All patients (aged 4 years 8 months to 12 years 11 months) were scanned by MRI in 2-4 days after injury. Patients were divided into three groups according to the annular ligamentinjuries severity, which were simple annular ligamentinjuries, annular ligamentinjuries combined dislocation, annular ligamentruptures combined dislocation. Results Simple annular ligamentinjuries were showed in 2 cases, which appeared high signal but continuous configuration. Annular ligamentinjuries combined dislocation were showed 9 cases. Bald head sign, thickening and continuous ligment were found on axial image, together with compression of the radial joint space on sagittal and coronal view. Annular ligamentruptures combined dislocation were showed in 4 cases. The ligment showed"bald head sign", tortuosity and uneven thickening on axial view and compression of the radial joint space on sagittal and coronal view. Combining with the other tissueinjuries were detected in 15 cases. Conclusion The annular ligamentinjuries show some MRI characteristics. Bald head sign is specific in the annular ligamentinjuries of pediatric patients.