Table 5 Inter-group comparison of radiological parameters for patients in MCGR and TGRÂ groups
|  | Whole cohort (N = 27) | MCGR (N = 16) | TGR (N = 11) | p value | Power^ | Whole cohort (N = 27) | MCGR (N = 16) | TGR (N = 11) | p value |
|---|---|---|---|---|---|---|---|---|---|
| Â | Good coronal balance (count in %) | Â | Good sagittal balance (count in %) | ||||||
Pre-surgery | 72% | 69% | 78% | 1.000 | Â | 62% | 69% | 50% | 0.339 |
Post-index surgery | 81% | 85% | 75% | 0.618 | Â | 71% | 62% | 88% | 0.201 |
Final fusion | 82% | 83% | 80% | 1.000 | Â | 70% | 67% | 75% | 0.778 |
Parameters |  | Difference in changes of TGR vs MCGR (Subseq time-point—pre-surgery)TGR – (Subseq time-point—pre-surgery)MCGR | p value | ||||||
| Â | Mean coronal Cobb angle of major curve, degrees (SD) | Â | Â | Â | |||||
Pre-surgery | 56.3 (16.0) | 51.8 (13.5) | 63.5 (17.8) | 0.069 | Â | Â | Â | Â | Â |
Post-index surgery | 35.2 (18.0) | 26.2 (6.6) | 46.8 (21.6) | 0.004* | 0.93 | -21.1 (12.4) | 0.134 | ||
Final fusion | 27.3 (13.0) | 25.8 (11.1) | 28.7 (15.1) | 0.682 | Â | -28.6 (20.2) | 0.379 | ||
| Â | Mean sagittal balance, mm (SD) | ||||||||
Pre-surgery | 20.7 (21.4) | 24.6 (22.6) | 14.4 (18.9) | 0.250 | Â | Â | Â | Â | Â |
Post-index surgery | 28.5 (66.7) | 20.5 (21.7) | 41.5 (107.6) | 0.497 | Â | 10.3 (62.8) 7.4 (21.2) | 0.246 | ||
Final fusion | 16.8 (14.9) | 15.0 (14.0) | 19.6 (18.0) | 0.661 | Â | 0.630 | |||
| Â | Mean coronal balance, mm (SD) | ||||||||
Pre-surgery | 13.3 (14.8) | 16.4 (15.8) | 8.0 (11.5) | 0.177 | Â | Â | |||
Post-index surgery | 12.3 (12.3) | 9.8 (8.8) | 16.1 (16.3) | 0.279 | Â | 15.8 (9.7) | 0.122 | ||
Final fusion | 9.5 (11.8) | 7.5 (12.5) | 11.8 (11.8) | 0.566 | Â | 10.9 (9.5) | 0.281 | ||
| Â | Global kyphosis, degrees (SD) | ||||||||
Pre-surgery | 32.8 (20.8) | 27.8 (21.2) | 40.9 (18.3) | 0.118 | Â | Â | Â | ||
Post-index surgery | 28.0 (18.6) | 23.0 (17.0) | 36.2 (19.3) | 0.118 | Â | -2.7 (6.9) | 0.698 | ||
Final fusion | 38.9 (17.7) | 33.5 (18.7) | 47.0 (14.6) | 0.260 | Â | -15.6 (16.6) | 0.374 | ||
| Â | Lumbar lordosis, degrees (SD) | ||||||||
Pre-surgery | 53.5 (14.9) | 54.5 (13.6) | 52.0 (17.4) | 0.682 | Â | Â | Â | ||
Post-index surgery | 46.8 (12.3) | 48.0 (15.1) | 44.9 (5.9) | 0.510 | Â | 3.9 (8.2) | 0.642 | ||
Final fusion | 58.6 (12.3) | 61.4 (13.7) | 54.5 (10.0) | 0.419 | Â | -17.1 (18.4) | 0.377 | ||
| Â | Mean T1-S1 spine length, mm (SD) | ||||||||
Pre-surgery | 306.3 (66.6) | 332.1 (55.7) | 265.1 (63.9) | 0.009* | 0.79 | Â | Â | ||
Post-surgery | 364.7 (131.3) | 369.5 (44.9) | 356.9 (213.7) | 0.838 | Â | 60.4 (123.6) | 0.304 | ||
Final fusion | 379.0 (63.1) | 397.4 (58.7) | 351.4 (67.1) | 0.283 | Â | 52.8 (50.5) | 0.984 | ||
| Â | Mean T1-T12 spine length, mm (SD) | ||||||||
Pre-surgery | 221.6 (156.2) | 209.9 (34.0) | 240.4 (255.4) | 0.638 | Â | Â | Â | ||
Post-index surgery | 218.4 (86.2) | 221.7 (25.3) | 213.2 (141.8) | 0.833 | Â | -9.9 (196.8) | 0.555 | ||
Final fusion | 229.9 (44.7) | 243.4 (36.7) | 209.7 (53.3) | 0.266 | Â | 24.9 (25.8) | 0.517 | ||