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In page Hip dysplasia:

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Early hip dysplasia can often be treated using a Pavlik harness[1] (see photograph) or the Frejka pillow/splint[2] in the first year of life with usually normal results. Complications can occur when using the Pavlik harness. Cases of femoral nerve palsy[3] and avascular necrosis of the femoral head have been reported with the use of the Pavlik harness,[4] but whether these cases were due to improper application of the device or a complication encountered in the course of the disorder remains unresolved. Complications arise mainly because the sheet of the iliopsoas muscle pushes the circumflex artery against the neck of the femur and decreases blood flow to the femoral head, so the Frejka pillow is not indicated in all the forms of the developmental dysplasia of the hip.[citation needed]