Fig. 1From: Relationship between the atlantodental interval and T1 slope after atlantoaxial fusion in patients with rheumatoid arthritisMeasurement of the radiological parameters. The Oc-C2 angle, C2–C7 angle, T1 slope, and cSVA were measured between the lines shown in this figure. cSVA, cervical sagittal vertical axisBack to article page