Open-book fractures of the pelvis are uncommon during childhood and require urgent treatment from the association with other abdominal, vascular or nervous injuries. The case discussed is an open-book fracture (type B1, Tile classification) associated with triradiate cartilage injury (type I, Salter-Harris classification) in an 11-year-old female. Surgical treatment was delayed for 2 months due to an associated extensive cutaneous lesion which required an adequate treatment. The delayed intervention did not affect the radiological and clinical healing of the fracture.