Developmental Dysplasia ofthe Hip (发育性髋关节发育不良，DDH)》 2020.4
2020.4 Developmental Dysplasia of the Hip （ DDH）
Purposes to understand the cause,master pathology,clinical manifestations,x-ray features, differential diagnosis and treatment principles. 解病因，掌握病理、临床表现、X线特征、鉴别诊断、治疗原则) Main Difficulties Key Points:pathological changes,clinical manifestations and examinations,x-ray features,treatment principles.（病理改变、临床表现 及检查、治疗原则) Difficulties:physical examination,x-ray features,differential diagnosis 特征，鉴别诊断)
Purposes : to understand the cause, master pathology, clinical manifestations, x-ray features, differential diagnosis and treatment principles. Ⅰ Key Points : pathological changes, clinical manifestations and examinations, x-ray features, treatment principles.（ ） Ⅱ Difficulties : physical examination, x-ray features, differential diagnosis（ ）. Ⅲ Main Difficulties
I.Overview (I)Definition:DDH means taking a series of hip joint disorders in which the femoral head and abnormal in development or anatomy. 是在出生前或出生后股骨头和髋白在发育和/或解剖关系发生异常的一系列髋 关节病症
Ⅰ. Overview (Ⅰ) Definition: DDH means taking a series of hip joint disorders in which the femoral head and abnormal in development or anatomy
Congenital Dislocation of the Hip,CDH Developmental Dysplasia of the Hip DDH
Congenital Dislocation of the Hip, CDH Developmental Dysplasia of the Hip ，DDH
(Ⅱ)Epidemiology(流行病学) incidence rate 1 %0~1.5 %o 发病率：0.1-1.5% 1.White>Yellow>Black 1)白人>黄种人>黑人 2.north>south (China) 2)北方>南方（我国） 3.female>male (girls account for 80-90%) 3)男女之比1：5.36 4.left lateral bilateral right lateral 4)左侧>双侧>右侧
（ Ⅱ ）Epidemiology（流行病学） incidence rate 1 ‰ ~ 1.5 ‰ 1. White>Yellow>Black 2. north>south（China） 3. female>male（girls account for 80-90%) 4. left lateral > bilateral > right lateral