Before lengthening can begin, it is important to first stabilize the hip joint in many children with proximal femoral focal deficiency. Without this, they are at increased risk for dislocation of the hip joint during lengthening. This 2-year-old boy's radiographs are shown before and after Dega osteotomy.
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| Anteroposterior view radiograph of the pelvis in a 3-year-old girl shows that the center edge angle = 11° on the short side and 15° on the long side. Both sides are dysplastic. The minimal normal center edge angle that is safe for lengthening is 20°. |
Anteroposterior view radiograph of pelvis shows that the center edge angle = 35° after a Dega osteotomy that was performed before lengthening of the femur. |