What’s the fee? A Grabb-Oakes measurement of 9mm or greater is indicative of compression right? My clivo-axial angle was 132 in 2015 and 140 in 2018, about a week ago. They’re both under 150. My Grabb-Oakes was 9.67 mm in 2015 without inclusion of the dura mater. My 2018 Grabb Oakes measured 9.07 without inclusion of dura mater.