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7Posterior column: fixation

The obturator oblique view can be used to confirm appropriate placement. The projection of the screw should aim at the ischium. The most common mistake is to drive the screw in the direction of the posterior wall.

Screws that penetrate the posterior column cortex may injure the sciatic nerve.

Because this view is obtained with the C-arm rolled in the direction of the surgeon, access to the acetabulum is obstructed. This view is therefore used as confirmation and difficult to use for real time navigation.