婴幼儿发育性髋关节脱位(developm ental d islocation of theh ip,DDH)是临床最常见的儿童下肢畸形,过去认为该病是先天性疾病,并称之为先天性髋关节脱位。近年国内外研究发现,本病除先天因素外,后天因素也起重要作用,是一种动态发育异常[1]。由于新生儿出生时体征较隐匿,早期 Developmental enthalpy dislocation of the hip (DDH) is the most common form of lower extremity deformity in children and was previously considered a congenital condition and is referred to as congenital dislocation of the hip. In recent years, domestic and foreign studies have found that in addition to the natural causes of this disease, acquired factors also play an important role, is a dynamic developmental abnormalities [1]. Due to neonatal signs of impotence at birth, early