Table I.
Radiographic parameters of sagittal spine-pelvis-leg alignment2
| Parameters | Abbreviation | Description |
|---|---|---|
| Pelvic incidence (°)2 | PI | The angle between the line joining the hip axis and the centre of the S1 end plate and the line orthogonal to the S1 end plate |
| Pelvic tilt (°)2 | PT | The angle between the line joining the hip axis and the centre of the S1 end plate and the reference vertical line |
| Sacral slope (°)2) | SS | The angle between the line along the S1 end plate and the reference horizontal line |
| Lumbar lordosis (°) | LL | Segmental angle of spinal segment in lordosis (L1 to L5) |
| Spinosacral angle (°) | SSA | The angle between the line along the S1 end plate and the reference vertical line |
| C7 tilt (°) | C7T | The angle between the line joining the centre of S1 end plate and the centre of C7 and the reference vertical line |
| Sacrofemoral angle (°)2 | SFA | The angle between the line along the S1 end plate and the line along the axis of the femur |
| Pelvic femoral angle (°)3 | PFA | The angle between the line joining the hip axis and the centre of the S1 end plate and the line along the axis of the femur |
| Femoral inclination (°)28 | FI | The angle between the line along the axis of the femur and the reference vertical line |