| Group | 1 month after the operation | 3 months after the operation | 6 months after the operation | |||||||||
| Excellent | Good | Poor | Rate (%) | Excellent | Good | Poor | Rate (%) | Excellent | Good | Poor | Rate (%) | |
| A (n = 19) | 0 | 0 | 19 | 0 | 0 | 5 | 14 | 26.31 | 5 | 11 | 13 | 84.21 |
| B (n = 20) | 0 | 6 | 14 | 30.0* | 7 | 13 | 0 | 100* | 20 | 0 | 0 | 100* |
| P value | 0.006 | 0.021 | 0.034 | |||||||||