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女性,2岁。走路呈鸭步,双下肢等长,Allis征阴性,0rtolani试验阳性。骨盆X线片显示股骨头骨骺明显变小,外移呈Ⅰ度脱位,髋臼指数大。复位后最严重的并发症是()
A . A.复位后再脱位
B . 复位后半脱位
C . 股骨头缺血性坏死
D . 髋臼发育不良
E . 关节功能障碍
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