Table 2 Comparison of minimal invasiveness, safety and accuracy of pedicle screw placement between patients with conventional tracer fixation group and modified tracer minimally invasive fixation group
Group | Dimension of wound (mm) \( \left(\overline{x}\pm s\right) \) | Amount of wound bleeding (ml) \( \left(\overline{x}\pm s\right) \) | Time of tracer fixation (min) \( \left(\overline{x}\pm s\right) \) | complication | Positions grade of screws | ||||
|---|---|---|---|---|---|---|---|---|---|
A | B | C | D | E | |||||
C* | 40.28 ± 8.52 | 12.02 ± 2.24 | 5.08 ± 1.06 | 0 | 113 | 5 | 0 | 0 | 0 |
M* | 6.08 ± 1.02 | 1.46 ± 0.84 | 1.56 ± 0.32 | 0 | 118 | 3 | 0 | 0 | 0 |
P value | < 0.01 | < 0.01 | < 0.05 | – | > 0.05 | ||||