Pelvic inlet and outlet views
Pelvic outlet view
- is directed in a plane parallel to the rim of the pelvis and perpendicular to the sacrum.
- The obturator foramina are well visualised.
- Used in
- Making sure S2AI and iliac screws not breeched into the sciatic notch.
- Outlet = out through the pelvis
- Imaging technique:
- Beam angled 25-40 degrees cephalad (dependent on patient anatomy)
- Symphysis should line up with spinous processes and sacral foramen should appear round
Pelvic inlet view
- is directed parallel to the anterior sacral cortex and demonstrates the pelvic rim.
- Used to make sure the S1 screws have breeched the anterior cortex of the S1. Lateral S1 views do not show this well as the S1 anterior cortex is curved.
- Inlet = into the pelvic brim
- Imaging technique:
- Beam tilted 25-40 degrees caudal (dependent upon patient’s sacral and pelvic anatomy, and positioning bumps/bone foam)
- Rami should be superimposed on each other
Obturator inlet and outlet views
Obturator inlet views
- Leeds view
- The obturator inlet view allows for visualization of the inner and outer tables of the supraacetabular corridor (Blue dots)
- Used in pelvic surgery fixation
- Placing supraacetabular (LCII) screws, anterior pelvic ex fix pins, or INFIX screws
- Imaging technique:
- 45 degrees of rollover towards injured side and 25-40 degrees of inlet
Obturator outlet views
- Tear drop view
- This view shows the supraacetabular corridor that runs from AIIS to PSIS (blue dots), also is a view used to confirm that an anterior column (or SPR) screw is not penetrating the acetabulum (yellow dots)
- Used during
- S2AI screws
- Iliac screws
- Imaging technique:
- 45 degrees of roll over towards injured side and 30 degrees of outlet
- Change the cranio-caudal angulation so that the acetabulum is not overlapped into the tear Drop