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. 2018 Aug 15;12(3):362–370. doi: 10.14444/5042

Figure 2.

Figure 2

Global radiographic parameters measured including the cervico-thoracic pelvic angle (CTPA), the C2 pelvic angle (CPA), and the T1 pelvic angle (TPA). CTPA is a global angular measure of cervical sagittal alignment and a correlate of the C2-C7 plumb line. T1 pelvic angle is a measure of global sagittal alignment and a correlate of the C7 sagittal vertical axis. CPA is the angle of a line from C2 centroid to the femoral heads (FH) and a line from the FH to the middle of the S1 endplate. T1 pelvic angle is the angle of a line from the center of T1 to the FH and a line from the FH to the center of the S1 endplate. CTPA is the angle of a line from C2 centroid to the FH and a line from the FH to the center of T1. CTPA is the result of subtracting T1 pelvic angle from CPA.