Pathologic Morphology of the Acetabulum in Paralytic and Congenital Hip Instability

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Abstract
The nature of acetabular deficiency in both congenital and paralytic hip instability was investigated by computed tomography (CT). Hips (66) in 35 children with paralytic or congenital hip instability underwent transpelvic CT. Two angles were defined: angle 1 is a function of anterior and angle 2 a function of anterior and angle 2 a function of posterior coverage. The sum of the 2 angles represented acetabular depth. Results showed anterior deficiency in cerebral palsy and congenital hip instability. An absolute acetabular deficiency as opposed to a torsional disorder was present.

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