From: Relationship between spinal imbalance and knee osteoarthritis by using full-body EOS
Sagittal Vertebral Axis | Horizontal offset distance between an imaginary plumb line dropped from the center of the C7 vertebra to the posterosuperior superior endplate of S1 |
Pelvic tilt | Acute angle subtended by a line drawn from the midpoint of the superior endplate of S1 to the bicoxafemoral hip center and an imaginary vertical line |
Pelvic incidence | Angle subtended by the perpendicular of superior endplate of S1 and a line drawn from the midpoint of the superior endplate of S1 to the bicoxafemoral hip center |
Global tilt | Angle subtended by a line drawn from the midpoint of the superior endplate of S1 to the bicoxafemoral hip center and a line from the center of the C7 vertebra to the superior endplate of S1 |
Lumbar lordosis | Angle measured using the inferior endplate of T12 and the superior endplate of S1 |
Hip-Knee-Ankle angle | Acute angle between femur mechanical axis and tibial mechanical axis in the coronal plane |
Knee flexion angle | Angle between femur mechanical axis and tibial mechanical axis In the sagittal plane |
Lateral distal femoral angle | Angle between the femur mechanical axis and the distal articular surface of the femur in the coronal plane |
Medial proximal tibial angle | Angle between the tibial mechanical axis and the proximal articular surface of the tibia in the coronal plane |