Fractures of the sacrum in children are rare. In the 17 cases described in the past 25 years, surgery was indicated only for treatment of the consequences of the primary injury. We present the case of a 10-year-old girl who sustained the following injuries as a result of a fall from a swing: posterior angulation of S2/3 with suspected injury of anterior ligamentous structures, fracture of the proximal part of the S4 body with a displacement by the bone width anteriorly and contraction of 5 mm, posterior angulation of S5/Co1 also with a suspected injury of anterior ligamentous structures. After an unsuccessful attempt at closed reduction, open reduction and fixation by two K-wires was indicated. The fracture healed in 8 weeks. Two years after the treatment, the patient is without complaints and limitations. The question is whether surgery was necessary for treatment of this fracture or whether spontaneous healing and subsequent remodelling of the sacral bone in such a young patient may be expected which would be also fully satisfactory. In our view, the described surgical treatment was appropriate and is definitely indicated for patients with a similar injury associated with a neural lesion.