Table 1. Demographics and Sagittal Parameters of Study Patients.
| Demographics | All patients (n=80) | Sagittally balanced patients (n=28) | Sagittally imbalanced patients (n=52) | p value | ||
|---|---|---|---|---|---|---|
| Age (yr) | 63.2±13.3 | 55.5±14.0 | 67.3±11.0 | 0.010* | ||
| Sex (male/female) | 40/40 | 20/8 | 20/32 | 0.005 * | ||
| Weight (kg) | 64.8±13.3 | 68.3±9.0 | 62.9±12.9 | 0.051 | ||
| Height (cm) | 160.7±9.9 | 166.3±8.1 | 157.8±9.6 | 0.001* | ||
| BMI (kg/m2) | 25.1±4.24 | 24.7±2.7 | 25.3±4.9 | 0.582 | ||
| Pathology | ||||||
| Cervical myelopathy | 6 | 5 | 1 | |||
| Degenerative spondylolisthesis | 28 | 8 | 20 | |||
| Herniated lumbar disc | 8 | 2 | 6 | |||
| Lumbar degenerative kyphosis | 6 | 0 | 6 | |||
| Spondylolytic spondylolisthesis | 3 | 0 | 3 | |||
| Lumbar stenosis | 29 | 13 | 16 | |||
| Sagittal parameters | ||||||
| PI | ||||||
| WSX | 50.2±11.5 | 42.6±6.4 | 54.2±11.7 | <0.001* | ||
| EOS | 50.6±11.5 | 43.2±6.9 | 54.6±11.6 | <0.001* | ||
| LL | ||||||
| WSX | -35.3±14.5 | -44±7.9 | -30.5±15.1 | <0.001* | ||
| EOS | -35.5±14.4 | -44.3±8.9 | -30.8±14.6 | <0.001* | ||
| PI-LL | ||||||
| WSX | 14.9±18.8 | -1.4±6.7 | 23.7±17.3 | <0.001* | ||
| EOS | 15.1±18.9 | -1.1±7.0 | 24.0±17.3 | <0.001* | ||
| PT | ||||||
| WSX | 21.6±12.2 | 10.8±4.7 | 27.4±10.9 | <0.001* | ||
| EOS | 19.4±11.5 | 9.4±5.7 | 24.9±10.2 | <0.001* | ||
| SS | ||||||
| WSX | 28.6±8.7 | 32.6±7.0 | 26.5±8.9 | 0.002* | ||
| EOS | 30.8±8.1 | 33.9±5.9 | 29.2±8.7 | 0.014* | ||
BMI, body mass index; WSX, conventional whole spine X-ray; PI, pelvic incidence; LL, lumbar lordosis; PT, pelvic tilt; SS, sacral slope.
Descriptive data are presented as mean±standard deviation. 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.
*p<0.05.