Article Figures & Data
Figures
- Figure 1
Radiographs of patients who are stable (A, B, and C) and kyphosis progression (D, E, and F) after short-segment pedicle fixations. (A) and (D) were obtained immediately after injuries. (B) and (E) were obtained after fixation. (C) and (F) were obtained at a 2-y follow-up.
- Figure 2
Study flowchart.
Tables
Associated Factors Kyphosis Progression Group (n = 32) Stable Group
(n = 59)P Value Age, y, mean ± SD 43.56 ±15.5 42.92 ±11.5 0.821 >60 y, n (%) 5 (15.6%) 4 (6.8%) 0.269 Gender, n (%) Male 23 (71.8%) 36 (61.2%) 0.362 Female 9 (28.2%) 23 (38%) Body mass index, mean ± SD 23.24 (±3.4) 22.63 (±3.3) 0.403 >25, n (%) 9 (28.1%) 14 (23.7%) 0.801 Fracture level, n (%) T11 0 1 (1.7%) 0.711 T12 6 (18.8%) 16 (27.1%) L1 16 (50.0%) 29 (49.2%) L2 10 (31.2%) 13 (22.0%) AO spine Thoracolumbar injuries system, n (%) B1/B2 1 (3.0%) 5 (8.5%) 0.326 A2 3 (9.4%) 6 (10.2%) A3 14 (43.8%) 33 (55.9%) A4 14 (43.8%) 15 (25.4%) Posterior ligamentous complex injuries, n (%) 20 (62.5%) 27 (45.8%) 0.187 Thoracolumbar injury classification and severity score, mean ± SD 4.69 ± 0.64 4.62 ± 0.87 0.399 Initial kyphotic angle, mean ± SD 15.41 ± 9.9 15.08 ± 8.3 0.869 Postoperative kyphotic angle, mean ± SD 3.72 ± 8.0 4.36 ± 7.4 0.705 Loss correction angle, mean ± SD 9.47 ± 3.6 2.29 ± 1.7 <0.001 Intermediate screw, n (%) 29 (90.6%) 54 (91.5%) 1.000 Surgical technique, n (%) Open technique 10 (31.3%) 17 (28.8%) 0.814 Minimally invasive technique 22 (68.7%) 42 (71.2%) Follow-up time, mean ± SD 21.98 ± 10.3 26.76 ± 9.9 0.031 Load-sharing classification Comminution 1 9 (28.1%) 18 (30.5%) 0.569 2 12 (37.5%) 27 (45.8%) 3 11 (34.4%) 14 (23.7%) Apposition 1 11 (34.4%) 23 (39.0%) 0.769 2 14 (43.8%) 27 (45.8%) 3 7 (21.8%) 9 (15.2%) Reduction 1 3 (9.4%) 6 (10.2%) 0.466 2 8 (25%) 22 (37.3%) 3 21 (65.6%) 31 (52.5%) Total score >6 17 (53.1%) 22 (37.3%) 0.185 - Table 2
Multivariable logistic regression analysis between associated factors and kyphosis progression.
Associated Factors OR 95% CI P Value Age >60 y 3.81 0.66–21.88 0.133 Body mass index >25 1.97 0.63–6.09 0.241 AO spine TL system B1/B2 1.00 A2 4.45 0.28–70.59 0.290 A3 4.70 0.41–53.29 0.212 A4 7.95 0.69–91.85 0.097 Posterior ligamentous complex injuries 3.14 1.05–9.38 0.040 Intermediate screw 0.11 0.01–0.93 0.043 Minimally invasive technique 0.80 0.27–2.41 0.690 Results were already controlled by the initial and postoperative kyphotic angle and follow-up time.
- Table 3
Logistic regression analysis and area under ROC curve between load-sharing classification score and kyphosis progression.
Load-Sharing Classification OR 95% CI Area Under
ROC CurveP Value Total score ≤6 1.00 >6 1.91 0.80–4.56 0.58 0.147 Abbreviations: ROC, receiver operating characteristic.
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