The long-term follow-up study of Colonna capsular arthroplasty for developmental dislocation of the hip, especially in terms of duration of the hip function and the onset of coxarthrosis, was investigated. There were 68 hips (63 patients, 54 female and 9 male). The age at the time of the surgery ranged from 11 months to 12 years and 9 months (average 4 years and 3 months). According to the Kaplan-Meier's method, the average survival rate of the hip function was 25 years and 8 months and the survival rate for 25 years was 53%, if the end point was defined as the time hip pain began. Then the average survival rate of hip function was 28 years and the rate was 60.3%, if the end point was defined as the time radiograph showed advanced stage. Clinically, the hip function, especially walking ability, proved to be maintained for long time. The long-term result was worse, when the operation was performed when the patient was older than 6 years old or when patient had previous treatment.