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Table 3 Surgical data of patients divided by axial ossification type and sagittal ossification type

From: The influence of ossification morphology on surgery outcomes in patients with thoracic ossification of ligamentum flavum (TOLF)

  Unilateral (n = 14) Bilateral (n = 18) Bridged (n = 16) P value Beak (n = 19) Round (n = 29) P value
COR, mean ± SD, % 22.68 ± 5.54 38.42 ± 9.69 41.63 ± 9.13  < 0.001* 31.66 ± 10.06 37.02 ± 12.15 0.117
umCOR, mean ± SD, % 45.36 ± 11.09 47.41 ± 13.60 51.23 ± 14.57 0.470 47.12 ± 13.72 48.72 ± 13.06 0.685
OLF level
T1–T4, no. (%) 1 (7.1) 3 (14.7) 4 (25.0) 0.323 2 (10.5) 4 (13.8) 0.906
T5–T9, no. (%) 2 (14.3) 1 (5.56) 4 (25.0)   3 (15.8) 6 (20.7)  
T10–T12, no. (%) 11 (78.6) 14 (77.8) 8 (50.0)   14 (73.7) 19 (65.5)  
Intramedullary signal change on T2WI, no. (%) 7 (50.0) 12 (66.7) 11 (68.8) 0.513 13 (68.4) 17 (58.6) 0.493
DO, no. (%) 2 (14.3) 5 (27.8) 5 (31.3) 0.545 4 (21.1) 7 (24.1) 0.804
Surgical methods        
Posterior decompression, no. (%) 8 (57.1) 6 (33.3) 3 (18.8) 0.880 8 (42.11) 9 (31.0) 0.433
Posterior decompression with fusion, no. (%) 6 (42.9) 12 (66.7) 13 (81.3) 11 (57.9) 20 (69.0)
  1. COR canal occupation rate, umCOR unilateral maximum of canal occupation, DO dural ossifification, SD standard deviation