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患儿，女性，5岁，因右下肢跛行3年而入院。患儿2岁方学会走路，当时被发现右下肢行走不稳，升降步态，无外伤史。体检：体温36．5℃。右下肢无红肿、无压痛，下肢肌力正常，皮肤感觉正常，右髋关节正常，外展稍受限，其余关节活动正常。Allis征（＋），Trendelenburg试验（＋），X线摄片示：右Shenton线不连，髋臼指数50°，股骨头位于Perkin方格的外上象限，且发育差，变小，但密度正常，前倾角80°，臼头无破坏，颈干角140°。关于CDH的症状和体征，下述哪些是正确的（）。A.
Ortolani试验常被用做3岁以上患儿的检查
B.
Allis征被认为是CDH的特异体征
C.
套叠试验往往呈阳性
D.
Trendelenburg试验阳性是指一足站立，另一下肢抬起，下肢抬起侧臀部下沉，说明臀部下沉侧臀中肌的功能不全
E.
单侧髋脱位时呈摇摆步态
F.
臀纹和大腿皮纹不对称，股三角空虚会阴部增宽
G.
Allis征只适用于单侧发病
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