Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1007%2Fs13244-018-0600-y/MediaObjects/13244_2018_600_Fig3_HTML.gif)
Diagram of the pelvis at the iliac wings level showing the principal structures to avoid (1 femoral nerve, 2 iliac vessels and lumbosacral trunk, 3 sacral canal and foramina, 4 visceral structures) and the safe approaches (green areas)
Diagram of the pelvis at the iliac wings level showing the principal structures to avoid (1 femoral nerve, 2 iliac vessels and lumbosacral trunk, 3 sacral canal and foramina, 4 visceral structures) and the safe approaches (green areas)