الفهرس 
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Abstract
The basic goal of the treatment in developmental dysplasia of the hip is to achieve a stable concentric reduction and to maintain the reduction during childhood and adolescence. Aim and objectives: The aim of study was to compare the growth and development of the acetabulam following surgical concentric hip reduction after open reduction and capsularraphy alone and following open reduction, capsularraphy and incomplete periacetabular acetabuloplasty (IPA) in DDH patients aged between 12 months and 36 months. Subjects and methods : The present prospective randomized study included patients who had DDH in Mansoura University Hospital, pediatric orthopedic unit the study included 50 hips divided to two groups each contains 25 hips, the study compared between the results of open reduction and capsularraphy (group 1) and the results of open reduction, capsularraphy and incomplete periacetabular acetabuloplasty (group 2) and their effect: upon the acetabular growth and development in DDH patients. Result : Post-operative acetabular index had mean values of 37.12 and 20.20 in the study groups respectively, with statistical significant difference between the two groups for the superiority of group 2. Additionally, CEA had mean values of 12.80 and 22.08 post-operatively in the study groups respectively, with statistical significant difference for the superiority of group 2 with better head coverage. Conclusion : Based on the previous findings, incomplete periacetabular acetabuloplasty is a reliable adjunct to open reductions, and it is followed by a rapid acetabular growth response that avoids secondary pelvic procedures.