| Cannulated screw group | Solid screw group | Sum |
---|---|---|---|
Screws (no.) | 206 | 116 | 322 |
Diagnosis | Â | Â | Â |
 Degenerative disease (no.) | 33 | 18 | 51 |
 Trauma (no.) | 8 | 5 | 13 |
Gender | Â | Â | Â |
 Male (no.) | 18 | 10 | 28 |
 Female (no.) | 23 | 13 | 36 |
Age (years) | 56.3 ± 12.4 | 50.7 ± 10.0 | / |