QUANTITATIVE-ANALYSIS OF HIP-DYSPLASIA IN CEREBRAL-PALSY - A STUDY OFRADIOGRAPHS AND 3-D REFORMATTED IMAGES

Cerebral palsy patients (31 hips) were evaluated using radiographic an d three-dimensional (3-D) images to quantify hip anatomy. The 3-D imag es overcome distortions caused by joint contractures. Changes were mor e pronounced in the non-ambulators and characterized by shallow socket s with increased neck-shaft angles. These hips tended to subluxate in a posterior-superior direction and most had defects in the femoral hea ds. Ambulators had increased femoral anteversion but other hip paramet ers tended to improve with age. The 3-D measures of roof steepness and socket depth were found to correlate strongly with radiographic param eters of subluxation.