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目的:探讨发育性髋关节脱位(developmental dislocation of the hip, DDH)闭合复位术后髋关节恢复正常影像学表现的概率及其影响因素。方法:回顾性分析2004年1月至2015年12月采用闭合复位石膏固定治疗的507例(586髋)DDH患儿的病历资料。其中，男50例，女457例；左侧259髋，右侧164髋，双侧163髋。通过X线片评估T?nnis脱位程度分级、股骨头坏死(avascular necrosis of the femoral head，AVN)(Bucholz/Ogden分型)、髋臼指数(acetabular index，AI)和中心边缘角(center-edge angle，CEA)。尝试建立髋关节恢复正常X线的参考标准，并按该参考标准将患儿分为恢复组(200髋)和未恢复组(386髋)，对比分析两组患儿的年龄、性别、侧别、T?nnis分级、骨化核出现、术前和末次随访的AI和CEA、AVN和Severin分级。采用Cox回归分析、n t检验、卡方检验、方差分析研究影响DDH闭合复位术后髋关节恢复正常影像学的概率以及影响因素。n 结果:末次随访时，200髋(34.1%)恢复正常髋关节X线，78髋(13.4%)出现了Ⅱ型及以上AVN。年龄≥24个月患儿恢复率为8.8%(3/34)，显著低于40° and AVN were risk factors for a lower probability of achieving normal radiographic parameters. Among 200 hips achieving normal hip radiography, the mean recover time was (36.5±14.9) months. And 93% of hips recovered within 5 years post-CR. The recovery time (55.2±28.0 months) of hips with an age >24 months at reduction was significantly longer than other age groups (<12M: 32.2±18.0M; 12-18M: 36.9±11.9M; 18-24M: 38.6±15.1M) (n P<0.05). The recovery time of T?nnis II hips was significantly shorter than T?nnis III/IV hip [(32.8±15.7) vs. (40.2/40.7) months,n P40° and AVN are risk factors for a lower probability of achieving normal radiographic parameters in DDH children undergoing CR. And age above 24 months and T?nnis grade III/IV are associated with a longer time of achieving normal radiographic parameters.