Table 4.
Characteristics of Dual-Rod Patients Who Experienced a Rod Fracture and Those Who Did Not.a
| Dual-Rod No Fracture (N = 9) | Dual-Rod Fracture (N = 6) | P | |
|---|---|---|---|
| Age (years) | 69 ± 9 | 66 ± 8 | .5068 |
| Male | 4 | 1 | .5804 |
| Female | 5 | 5 | |
| Smoking | 0 | 0 | 1.0000 |
| HTN | 4 | 3 | 1.0000 |
| Osteoporosis | 1 | 2 | .5253 |
| CCI | 2.67 ± 1.32 | 2.67 ± 1.63 | >.9999 |
| Levels fused | 11.22 ± 3.63 | 11.50 ± 3.89 | .8899 |
| Interbody | 7 | 5 | 1.0000 |
| Rh-BMP2 (mg) | 22.00 ± 12.00 | 20.67 ± 11.98 | .8362 |
| Preoperative coronal Cobb (°) | 17.94 ± 9.77b | 56.82 ± 10.83 | <.0001 |
| Preoperative TL (°) | 24.14 ± 21.04b | 11.83 ± 18.73 | .2927 |
| Preoperative TK (°) | 21.57 ± 11.91b | 27.50 ± 19.87 | .5198 |
| Preoperative SVA (mm) | 100.30 ± 86.68b | 76.89 ± 43.20 | .5622 |
| Postoperative coronal Cobb (°) | 9.89 ± 8.28c | 22.45 ± 9.14 | .0197 |
| Postoperative TL (°) | 19.00 ± 19.65c | −6.00 ± 20.48 | .0392 |
| Postoperative TK (°) | 38.63 ± 8.90c | 22.67 ± 18.06 | .0490 |
| Postoperative SVA (mm) | 65.62 ± 73.69c | 18.70 ± 33.97 | .1759 |
Abbreviations: HTN, hypertension; CCI, Charlson Comorbidity Index; rh-BMP2, recombinant human bone morphogenetic protein-2; TL, thoracolumbar alignment; TK, thoracic kyphosis; SVA, sagittal vertical axis.
aBoldface indicates statistical significance.
bIn the no fracture group, one patient did not have preoperative AP and lateral radiographs available for measurement, and a second patient did not have lateral radiograph with landmarks visible for measurement, so preoperative coronal Cobb N = 8 and preoperative sagittal measurements N = 7.
cOne patient in the no fracture group did not have postoperative radiographs available for measurement, so N = 8 for all postoperative measurements in the dual-rod group no fracture group.