Table 1 Comparison of each index between the two groups
From: Multivariate analysis of pedicle screw invasion of the proximal facet joint after lumbar surgery
Index | Number of cases | Invasion group (724 cases) | Noninvasion group (497 cases) | χ2 | P |
|---|---|---|---|---|---|
Sex | 0.113 | 0.390 | |||
Male | 612 | 360 | 252 | ||
Female | 609 | 364 | 245 | ||
Age | 60.441 | 0.000 | |||
< 50 | 481 | 230 | 251 | ||
≥ 50 | 740 | 504 | 236 | ||
BMI | 71.745 | 0.000 | |||
< 24 kg/m2 | 393 | 211 | 182 | ||
24 ~ 28 kg/m2 | 330 | 149 | 181 | ||
> 28 kg/m2 | 498 | 364 | 134 | ||
Bone mineral density | 1.020 | 0.322 | |||
> −2.5 | 615 | 356 | 259 | ||
≤ −2.5 | 606 | 368 | 238 | ||
Proximal facet joint angle | 117.078 | 0.000 | |||
< 35° | 460 | 183 | 277 | ||
35 ~ 45° | 501 | 351 | 150 | ||
> 45° | 260 | 190 | 70 | ||
Degenerative lumbar spondylolisthesis | 47.921 | 0.000 | |||
No | 550 | 268 | 282 | ||
Yes | 671 | 456 | 215 | ||
Isthmic lumbar spondylolisthesis | 114.587 | 0.000 | |||
No | 370 | 133 | 237 | ||
Yes | 851 | 591 | 260 | ||
Fixed segment | 33.220 | 0.000 | |||
Upper lumbar | 163 | 63 | 100 | ||
Lower lumbar | 1058 | 661 | 397 |