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Patellar instability severity score. Odds for recurrence are five times higher when total score ≥ 4 points
| Risk factors (odds ratio) | Points | |
|---|---|---|
| Age (11.2) | > 16 years | 0 |
| ≤ 16 years | 1 | |
| Bilateral instability (3.2) | No | 0 |
| Yes | 1 | |
| Trochlear dysplasia (4.2) | None | 0 |
| Mild | 1 | |
| Severe | 2 | |
| Patellar height (1.4) | ≤ 1.2 | 0 |
| > 1.2 | 1 | |
| TT-TG (1.5) | < 16 mm | 0 |
| ≥ 16 mm | 1 | |
| Patellar tilt (1.9) | ≤ 20o | 0 |
| > 20 | 1 | |
| Total score range | 0–7 | |
