女孩，2岁半，走路呈鸭步，双下肢等长，Allis试验阴性，Ortolani.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X线片示双侧头臼对称，固定多长 时间为宜

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