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Cronbach's alpha coefficient values in the knee score and knee function score according to the period: preoperative, 3 months and 6 months.
| Period | Cronbach's alpha coefficient | |
| Knee score | Pre | 1 |
| 3 months | 0.96 | |
| 6 months | 0.92 | |
| Knee function score | Pre | 1 |
| 3 months | 1 | |
| 6 months | 1 | |
