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The comparison outcome of total patients and patients over 2-year follow-up.
| Number of patients | Follow-up (months) | Rate of loosening per patient (%) |
Rate of loosening per screw (%) |
||
|---|---|---|---|---|---|
| Clinical | Radiological | ||||
| All patients | 291 | 46.4 ± 22.7 | 32.6 ± 21.2 | 21.3 | 8.4 |
| Follow-up >2 years | 206 | 51.1 ± 20.8 | 40.7 ± 19.7 | 20.4 | 8.2 |
