Table 8.
Difference of Patients’ Characteristics Classified by Loosening of S2 Alar Screw.
| Loosening − | Loosening + | P | |
|---|---|---|---|
| Number | 10 | 13 | |
| Age, years (mean ± SD) | 68.7 ± 10.5 | 73.3 ± 4.0 | .16 |
| Sex, male–female | 1:9 | 1:12 | .85 |
| Preoperative BMI (kg/m2) | 26.1 ± 3.7 | 22.6 ± 3.1 | .02 |
| Preoperative BMD (g/cm2) | 0.85 ± 0.31 | 0.91 ± 0.27 | .24 |
| T-score | −0.96 ± 0.68 | −2.0 ± 1.16 | .86 |
| L5-S1 TLIF | +: 7, −: 3 | +: 9, −: 4 | .97 |
| L5-S1 fusion rate | 100.0% | 55.6% | .04 |
| Osteotomy (PSO or pVCR) | +: 3, −: 7 | +: 1, −: 12 | .16 |
| OLIF | +: 5, −: 5 | +: 9, −: 4 | .35 |
| Reoperation rate | 10.0% (1/10) | 30.8% (4/13) | .23 |
| ODI | |||
| Preoperative | 54.0 ± 14.5 | 47.9 ± 10.3 | .19 |
| Final follow-up | 23.1 ± 15.4 | 34.7 ± 17.3 | .12 |
Abbreviations: BMI, body mass index; BMD, bone mineral density; TLIF, transforaminal lumbar interbody fusion; PSO, pedicle subtraction osteotomy; pVCR, posterior vertebral column resection; OLIF, oblique lumbar interbody fusion; ODI, Oswestry Disability Index.
Boldface indicates significant difference with P value < .05.