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Table 2: New fracture classification
Time Period Cortoss PMMA
Adjacent Fracture Non-Adjacent Fracture Treatment-Level Fracture^{^a} Total Adjacent Fracture Non-Adjacent Fracture Treatment-Level Fracture^{^a} Total
No. (%) of patients with ≥1 additional fracture^{^b} 30 (18.5%) 26 (16.0%) 3 (1.9%) 45 (27.8%) 19 (20.2%) 16 (17.0%) 2 (2.1%) 30 (31.9%)
No. of fractures 43 32 4 79 21 24 2 47
        <30 days 13 (30.2%) 7 (21.9%) 1 (25.0%) 21 (26.6%) 6 (28.6%) 4 (16.7%) 2 (100.0%) 12 (25.5%)
        30 days to 1 yr (day 365) 28 (65.1%) 21 (65.6%) 3 (75.0%) 52 (65.8%) 12 (57.1%) 12 (50.0%) 0 (0.0%) 24 (51.1%)
        1 yr (day 366) to 2 yr (day 730) 1 (2.3%) 2 (6.3%) 0 (0.0%) 3 (3.8%) 3 (14.3%) 7 (29.2%) 0 (0.0%) 10 (21.3%)
        >2 yr 1 (2.3%) 2 (6.3%) 0 (0.0%) 3 (3.8%) 0 (0.0%) 1 (4.2%) 0 (0.0%) 1 (2.1%)
No. (%) of first-time patients with ≥1 additional fracture^{^c} 7 (10.3%) 6 (8.8%) 2 (2.9%) 12 (17.6%) 8 (18.2%) 6 (13.6%) 1 (2.3%) 12 (27.3%)
↵a Further collapse of treated fracture.
↵b Patients experiencing ≥1 additional fracture are counted once within each fracture category.
↵c Patients originally treated at 1 level who had not had previous fractures (Cortoss, n = 68; PMMA, n = 44).