Morphology of the acetabulum in hip dislocations caused by cerebral palsy.
Twenty-four hip joints in 20 children with spastic cerebral palsy were assessed by standardised three-dimensional reconstructions from computed tomographic scans. All the hip joints showed a channel-like ebony deformity of the acetabulum along which the femoral bead had slid out, indicating a unidirectional instability. The channel was oriented along the longitudinal axis of the body within a sector of 25 degrees anteroposteriorly. In relation to the pelvis, the dislocation was directed more dorsally by 20 degrees as a result of a flexion contracture of the hip. The size of the femoral head corresponded with the size of the acetabulum in every case, even in long-standing dislocations.
Brunner
R
R
Department of Orthopaedic Surgery, University of Basle, Switzerland.
Picard
C
C
Robb
J
J
D000077:Acetabulum / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D000293:Adolescent; D002547:Cerebral Palsy / Q000150:complications*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006617:Hip Dislocation / Q000000981:diagnostic imaging* / Q000209:etiology / Q000601:surgery; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods