Table 3. Comparison of Sagittal Balance, Spinal Curvature, Spinopelvic Parameters, and Lower Limb Parameter between WSX and EOS in Sagittally Balanced Patients†.
| WSX | EOS | p value | ||
|---|---|---|---|---|
| Sagittal balance | ||||
| C2-C7 SVA (mm)‡ | 21.1±25.1 | 18.4±9.3 | 0.244 | |
| C2-HA (°) | -0.7±3.2 | -0.5±3.3 | 0.819 | |
| C7-HA (°) | -1.9±7.0 | -1.6±3.2 | 0.489 | |
| C7-SVA (mm) | 0.3±10.2 | 2.0±32.0 | 0.763 | |
| TPA (°) | 7.1±9.3 | 4.9±4.8 | 0.010* | |
| Spinal curvature (°) | ||||
| T1-slope | 18.6±6.0 | 16.2±9.3 | 0.159 | |
| C0-C2 angle | -27.3±7.1 | -34.0±23.8 | 0.179 | |
| C2-C7 lordosis | -6.3±13.4 | -2.4±11.2 | 0.033* | |
| T2-T5 angle | 13.2±10.5 | 12.6±7.2 | 0.561 | |
| T5-T12 anglev | 22.8±11.3 | 21.3±9.8 | 0.241 | |
| T2-T12 angle | 33.9±7.4 | 31.1±9.0 | 0.042* | |
| T10-L2 angle | 6.3±8.1 | 5.2±8.0 | 0.171 | |
| Spinopelvic parameters (°) | ||||
| PI | 42.6±5.9 | 43.2±6.4 | 0.496 | |
| LL | -44±7.0 | -44.3±7.9 | 0.719 | |
| PI-LL | -1.4±9.9 | -1.1±6.7 | 0.668 | |
| PT | 10.8±6.9 | 9.4±4.7 | 0.040* | |
| SS | 32.6±8.9 | 33.9±7.0 | 0.158 | |
| Lower limb parameter (°) | ||||
| SFA | 163.8±30.9 | 162.7±7.0 | 0.473 | |
WSX, conventional whole spine X-ray; SVA, sagittal vertical axis; TPA, T1-pelvic angle; PI, pelvic incidence; LL, lumbar lordosis; PT, pelvic tilt; SS, sacral slope; SFA, sacrofemoral angle.
Descriptive data are presented as mean±standard deviation.
*p<0.05; †Sagittal balanced patients had none of the following conditions: PI-LL >10°, SVA >5 cm, and PT >20° on WSX. Positive values signify an anterior position of the vertical plumb line with respect to the caudal landmark for translation measurements and kyphosis for angular measurements; ‡Data did not follow a normal distribution, and Wilcoxon test was used.