1Tannast M, Siebenrock KA, Anderson SE. Femoroacetabu- lar impingement :radiographic diagnosis -what the radiol- ogist should know. A JR,2007,188 : 1540 - 1552.
2Johnston TL, Schenker ML, Briggs KK, et al. Relationship between offset alpha and hip chondral injury in femorace- tabular impringement. Arthroscopy ,2008 ,24 :669 - 675.