Table 5.
Radiological follow-up of patients who underwent removal of posterior instrumentation
| Monosegmental ACR | Bisegmental ACR | P value | |
|---|---|---|---|
| n | 9 (50%) | 6 (32%) | 0.33 |
| Preop BKA (°) | 6.9 ± 10.7 | 13.8 ± 11.5 | 0.26 |
| Postop BKA (°) | − 8.4 ± 5.9 | − 5.7 ± 4.7 | 0.37 |
| Bisegmental surgical correction (°) | − 15.3 ± 8.1 | − 20.0 ± 11.6 | 0.42 |
| BKA at time of implant removal (°) | − 5.4 ± 5.0 | − 2.7 ± 4.9 | 0.34 |
| BKA at final follow-up (°) | − 1.8 ± 5.2 | − 1.6 ± 5.3 | 0.95 |
| Preop MKA (°) | 13.3 ± 8.1 | na | na |
| Postop MKA (°) | − 2.4 ± 3.3 | na | na |
| Monosegmental surgical correction (°) | − 15.7 ± 6.9 | na | na |
| MKA at time of implant removal (°) | − 0.4 ± 3.4 | na | na |
| MKA at final follow-up (°) | 1.0 ± 3.7 | na | na |
| Time to final radiological follow-up (months) | 35.4 ± 35.5 | 35.3 ± 14.7 | 0.99 |
| Bisegmental loss of correction (°) | 6.7 ± 2.9 | 4.2 ± 0.8 | 0.06 |
| Monosegmental loss of correction (°) | 3.3 ± 1.9 | na | na |
| Time to implant removal (months) | 16.7 ± 5.4 | 24.0 ± 6.8 | 0.037 |
| Bisegmental loss of correction until implant removal (°) | 3.0 ± 3.1 | 3.0 ± 1.3 | 0.96 |
| Monosegmental loss of correction until implant removal (°) | 2.0 ± 2.0 | na | na |
| Time implant removal to final follow-up (months) | 18.7 ± 31.6 | 11.3 ± 13.5 | 0.86 |
| Bisegmental loss of correction between implant removal and final follow-up (°) | 3.6 ± 3.2 | 1.2 ± 1.7 | 0.11 |
| Monosegmental loss of correction between implant removal and final follow-up (°) | 1.3 ± 3.0 | na | na |
Bold value indicate P < 0.05
ACR anterior column reconstruction, BKA bisegmental kyphosis angle, MKA monosegmental kyphosis angle, na not applicable