Table 1 Demographic data, perioperative outcomes and screw placement results for the RA-MIS and RA-OS
Minimally invasive surgery (N = 79) | Open surgery (N = 129) | Statistics | p Value | |
|---|---|---|---|---|
Age (year) | 56 (64–50) | 60 (64–54) | Z = − 1.615 | 0.106 |
Gender | χ2 = 3.2020 | 0.074 | ||
Male | 40 (44.6%) | 49 (44.4%) | ||
Female | 39 (55.4%) | 80 (55.6%) | ||
BMI (kg/m2) | 25.69 (27.68–23.53) | 25 (27.63–22.58) | Z = 1.1139 | 0.181 |
Operation time (minutes) | 150 (180–100) | 135 (180–120) | Z = − 0.034 | 0.973 |
Intraoperative blood loss (mL) | 100 (200–50) | 200 (400–200) | Z = − 6.347 | < 0.001 |
Postoperative hospital stay (days) | 5 (6–4) | 5 (7–4) | Z = − 2.658 | 0.008 |
Comorbidity | 1 | 0 | χ2 = 1.6203 | 0.203 |
Number of screws | 368 | 662 | χ2 = 0.0000 | 1.000 |
Thoracic spine | 50(13.6%) | 90 (13.6%) | ||
Lumbosacral Spine | 318 (86.4%) | 572 (86.4%) | ||
Small joint invasion | 9 (2.4%) | 20 (3.0%) | Fisher | 0.697 |
GRS grade | Fisher | 0.470 | ||
Grade A | 331 (90.0%) | 583 (88.1%) | ||
Grade B | 27 (7.3%) | 50 (7.5%) | ||
Grade (A + B) | 358 (97.3%) | 633 (95.6%) | ||
Grade C | 9 (2.4%) | 25 (3.8%) | ||
Grade D | 1 (0.3%) | 4 (0.6%) | ||
Screw deviation (mm) | 1.37 (2.05–0.86) | 1.34 (2.21–0.90) | Z = − 1.048 | 0.2948 |