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3Occipital fixation

Screw placement

The thickest part of the cranium is the dense ridge which runs vertically in line with the internal occipital crest.

The thickness of this crest is 11.5-15 mm in males and 10-12 mm in females and provides the best bone stock for screw purchase.

As you move laterally this crest becomes thinner and around 7-8 laterally to the midline, the bone thins out to a thickness of only 5-6 mm.