Sir,We read the article1 entitled “Outcome of one-stage treatment of developmental dysplasia of hip in older children” with great interest. We would like to congratulate the author for his excellent work. However, we have a few concerns. The author performed derotational osteotomy (DRO) along with femoral shortening in all the cases (30 hips).1 We would like to know whether any radiographic analysis was done preoperatively to assess the femoral anteversion. In our experience, we found that femoral anteversion is rarely exaggerated in DDH of the early walking age group,2 and this is in coordinance with other radiographic studies.34 Secondly, the author's method of assessing the need for derotation seems a little unclear. As the author performed femoral shortening in all cases, it means the hip cannot be reduced before shortening; then, how could they hold the limb in full internal rotation after reduction. Zadeh et al.5 recommended a test of stability to determine the need for DRO and, based on this test as well as the preoperative radiological assessment, we found that derotation is not essential in DDH of the early walking age group.6 Hence, we would like to clarify from the author regarding the assessment of anteversion and need of derotation, especially in those cases where the reduction of hip cannot be achieved before performing a shortening osteotomy. Thirdly, we would like to ask whether we need shortening in all cases as the data show that five out of 25 cases were less than 2 years of age. In such young children, can the reduction be achieved without femoral shortening; if so, we can get away with only open reduction and Salter's osteotomy. In our experience, we needed femoral shortening osteotomy in only three out of 15 cases.6