Three-dimensional computerized tomographic analysis of the deformity of lateral growth disturbance of proximal femoral physis.

Background: Lateral growth disturbance of the proximal femoral physis after treatment of developmental dysplasia of the hip, also known as type 2 avascular necrosis, has been described in a 2-dimensional (2D) plane with standard radiographs. It is not well described in the 3-dimensional plane using 3D computed tomography (CT) scan. The purpose of this study was to define the anatomy of the proximal femur after the lateral growth disturbance of the proximal femoral physis with 3D CT scans.

A radiological classification of lateral growth arrest of the proximal femoral physis after treatment for developmental dysplasia of the hip.

Background: After treatment of developmental dysplasia of the hip, lateral growth arrest of the physis of the proximal femur resulting in disturbance of the growth of the capital femoral epiphysis is not uncommon. The changes are usually not apparent until approximately the age of 9 years. The residual deformity has a variable prognosis at skeletal maturity.

The incidence of occult dysplasia of the contralateral hip in children with unilateral hip dysplasia.

Background: The purpose of this study is to determine the incidence of contralateral hip dysplasia in children with unilateral hip dysplasia.

Methods: We reviewed all patients with developmental dysplasia of the hip (DDH) who were evaluated at our institution until skeletal maturity (at least age 13 years). In the contralateral ("normal") hip, radiographic measurements of the acetabular angle >46 degrees, center edge angle <20 degrees, and migration index >20% were considered abnormal.