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Table 1 General information and clinical characteristics of patients with two grafting methods (n=33)

From: Intraarticular bone grafting in atlantoaxial facet joints via a posterior approach: nonstructural or structural—a minimum 24-month follow-up

  Total Nonstructural grafting (n=24) Structural grafting
(n=9)
p value
Age 0.246
 Mean±SD 51.58±16.24 50.94±16.07 50.52±16.53
 Median (mix-max) 14-74 21-74 14-72
Gender (n, %) 0.886
 Male 14 (42.42) 10 (41.67) 4 (44.44)
 Female 19 (57.58) 14 (58.33) 5 (55.56)
Basilar invagination (n, %) 0.442
 Yes 14 (42.42) 9 (37.5) 5 (55.56)
 No 19 (57.58) 15 (62.5) 4 (44.44)
Diagnosis (n, %) 0.348
 1 19 (57.58) 15 (62.50) 4 (44.44)
 2 11 (33.33) 8 (33.33) 3 (33.33)
 3 3 (9.09) 1 (4.17) 2 (22.23)
Operation time (min) 213.76±62.74 215.75±62.67 206.69±62.88 0.065
Intraoperative bleeding (ml) 148.64±93.92 150.78±94.60 152.76±98.05 0.409
Improvement in JOA score (%)
 1 day 11.96±13.92 11.17±13.35 13.23±14.29 0.594
 1 month 43.33±28.50 43.51±28.93 46.09±27.92 0.989
 3 months 59.01±29.70 59.29±30.13 60.54±29.45 0.683
 6 months 74.27±26.80 74.25±27.23 72.35±27.73 0.893
Last follow-up 79.58±27.53 79.33±27.94 77.96±28.83 0.889
Complications (n, %) 13 (39.39) 9 (27.27) 4 (12.12) 0.509
Implant failure 1 (7.69) 1 (11.11) 0 (0)  
Occipital neuralgia 12 (92.31) 8 (98.89) 4 (100)  
Follow-up time 26.03±4.45 26.33±4.73 25.22±3.70 0.531
  1. Diagnosis 1 means “C1-2 instability or dislocation without bony anomaly and without BI; Diagnosis 2 means “C1-2 instability or dislocation with assimilation of the atlas and/or congenital C2-3 unsegmentation with BI”; Diagnosis 3 means “lateral mass column collapsed due to rheumatoid arthritis, which lead to the secondary BI”