1Dr. T. Wirth,G. W. LeQuesne,D. C. Paterson. Ultrasonography in Legg-Calvé-Perthes disease[J] 1992,Pediatric Radiology(7):498～504
2F. J. Linnenbaum,H. Woltering,A. Karbowski,A. H?rle. Ultrasonography of the hip for Perthes’ disease[J] 1989,Archives of Orthopaedic and Trauma Surgery(3):166～172
3U. D?rr,M. Zieger,H. Hauke. Ultrasonography of the painful hip[J] 1988,Pediatric Radiology(1):36～40
4R. Graf. Classification of hip joint dysplasia by means of sonography[J] 1984,Archives of Orthopaedic and Traumatic Surgery(4):248～255
