The CT is a more accurate technique for detecting sclerotic bony change of osteritis condensans ilii thanplain radiograph. We analysed a comparison between CT and plain radiography of osteitis condensans ilii, acorrelation between osteitis condensans ilii and women of childbearing age. The result were as follow: 1. Theincidence of osteitis condensans ilii is 5.3% on KUB, 11.7% on CT when the width of iliac sclerosis is more than7.5mm as diagnsotic criteria. 2. We observed a osteitis condensans ilii between 19 years and 51 years of age, mostfrequently in fourth decade. 3. The width of iliac sclerosis is 10-13 mm in 3 cases of osteitis condensans ilii onboth CT &KUB, 7.5-9mm in 4 cases of osteitis condensans ilii on CT only. 4. The incidence of osteitis condensansilii is increased significantly when the width of iliac sclerosis is less than 7.5mm as diagnostic criteria. 5.Relatively high correlation between osteitis condensans ilii and delivary in our study (66.6%)