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Changes in Frankel grade in each group
| Group | Changes in Frankel grade | |||||
|---|---|---|---|---|---|---|
| Deterioration by 1 grade | No change | Improvement by 1 grade | Improvement by 2 grades | Improvement by 3 grades | Total | |
| 1 | 4 | 18 | 19 | 3 : B to D (n = 2); A to C (n = 1) | 1 (A to D) | 45 |
| 2 | 1 | 12 | 10 | 0 | 0 | 23 |
| 3 | 7 | 27 | 19 | 0 | 0 | 53 |
