T ōnnis依据股骨头脱位程度,将发育性髋脱位分为四度(图6‐2‐2‐.1):度:股骨头骨化中心位于髋臼外上缘的垂线之内,髋臼陡直(髋臼发育不良)。Congenital dysplasia and dislocation of the hipin children and adults,Springer‐Verlag,Berlin Heidelberg . ......