Table 2.
Status | Parameters of global sagittal spinal balance | Situation of compensatory mechanisms to regain sagittal balance |
---|---|---|
Sagittally balanced | SVA (sagittal vertical axis through center of C7 body) is within 5 cm from the posterior margin of the S1 endplate | Pelvic tilt is less than 1/3 of the pelvic incidence AND femoral shaft axis is vertical |
Sagittally compensating | SVA (sagittal vertical axis through center of C7 body) is within 5 cm from the posterior margin of the S1 endplate | Increased pelvic tilt (pelvic tilt is less than 1/3 of pelvic incidence) OR femoral shaft axis IS NOT vertical (indicating compensatory knee flexion to increase pelvic tilt or translate center of mass) |
Sagittally imbalanced | SVA (sagittal vertical axis through the center of the C7 body) is more than 5 cm from the posterior margin of the S1 endplate |