| Total | IIA | IIB | IIC |
Risk of hip number | 74 | 15 | 34 | 25 |
Improved | 59 | 14 | 28 | 17 |
No change | 4 | 1 | 1 | 2 |
add | 11 | 0 | 5 | 6 |
THRA | 10 | 0 | 4 | 6 |
Improvement rate (%) | 79.72 | 93.33 | 82.35 | 68 |