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Developmental dislocation of the hip(DDH) is the most common disease in pediatric orthopedics, acetabular dysplasia, nonconcentric hip-joint articulation and approximate femoral deformity are the main pathologic morphology abnormality. 發(fā)育性髖關(guān)節(jié)脫位是小兒骨科最常見(jiàn)的先天性畸形之一，髖臼發(fā)育不良、股骨頭脫位和股骨近端改變是髖關(guān)節(jié)脫位的主要骨性病理變化。