a study of mature caucasian pelves as compared to the smaller east indian pelves has shown that in the larger pelvis , when the gluteal tubercle and posterior superior iliac spine are used as landmarks , as advocated by o'brien , the pins will invariably pass within the soft tissue elements of the inner pelvis instead of being entirely within the bony ilium , as o'brien noted in the chinese pelves .
C0020889
bony ilium
C0030797
pelves