Radiological calculation of severity of slipped capital femoral epiphysis
severity of the slip in SCFE
The severity of the slip in SCFE can be graded by radiography.
- Wilson method - the relative displacement of the epiphysis on the metaphysis is calculated in a frog-leg lateral radiograph
- mild slip - epiphysis displacement is less than one third of the width of the metaphysis
- moderate slip - displacement is between one third and one half of the width
- severe slip - displacement is greater than one half of the width
- Southwick method - epiphyseal shaft angle is calculated on the frog-leg lateral radiograph, the epiphyseal shaft angle on the uninvolved side is subtracted from that on the involved side
- mild slip - < 30°
- moderate slip - between 30° and 50°
- severe slip - > 50° (1)
Reference:
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