What are two common techniques for external fixation for pelvis fractures?

Iliac crest/wing ex-fix pins

Start point – 3-4cm posterior to the ASIS centered between the inner and outer tables (within the gluteal pillar)

Fluoro image used – obturator outlet view

Pin direction – superior to inferior directed towards the supraacetabular bone

Supraacetabular ex-fix pins

Start point – center of the teardrop visualized on obturator outlet view and at least 2cm above superior acetabulum

Fluoro image used – obturator outlet view for start point, iliac oblique view for depth and to ensure ~1-2cm above sciatic notch, obturator inlet view for visualization of pin along its entire length between inner and outer tables

Pin direction – AIIS to PIIS