Severity's grade | Frequency * | Prognostic¶ | |
---|---|---|---|
According to Southwick head shaft angle (SHSA) ‡ (ref…) | |||
Mild | displacement <30 degrees compared with the unaffected side | 40 | 3% |
Moderate | displacement between 30 and 50 degrees compared with the unaffected side | 51 | 15.5% |
Severe | displacement > 50 degrees compared with the unaffected side | 9 | 14.2% |
According to Wilson (ref)£ | |||
Mild | displacement of the epiphysis < 1/3 of the diameter of the femoral neck |
||
Moderate | displacement of the epiphysis is > 1/3 but < ½ of the diameter of the femoral neck | ||
Severe | displacement of the epiphysis > ½ of the diameter of the femoral neck |