{'fraction_non_alphanumeric': 0.04, 'fraction_numerical': 0.015849056603773583, 'mean_word_length': 4.815789473684211, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 2, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Acetabular Development after Operative Treatment of Developmental Dislocation of the Hip

Purpose : To examine the acetabular development after the surgical treatment of a developmental dislocation of the hip (DDH). Materials and Methods : The serial radiographs of 27 hips were evaluated. The measurement included: acetabular index, CE angle, Smith's h/b, c/b ratio, medial joint space, and center-head distance discrepancy (CHDD). All the patients were followed up until they were at least 10 years old. The overall results were evaluated using the modified Severins classification (group I & II, satisfactory; group III & IV, unsatisfactory). Results : In the satisfactory group, the average acetabular index at 1 and 3 years after the pelvic osteotomy was ＜25. In the satisfactory group, the average CHDD 1 and 3 years after surgery was 6%. Eighty-two percent of hips with a CHDD ＜6% at postoperative 1 and 3 years were in the satisfactory group, whereas 81% of hips with CHDD ＞6% were in the unsatisfactory group. Conclusion : The most reliable factors for predicting normal acetabular development after surgery were an acetabular index ＜25 and a CHDD ＜6%. If the hips do not meet the criterion of a CHDD＜6% after the osteotomy of one component (either the pelvic or femur) then the other component must be osteotomized.