The c/b ratio in the radiological monitoring of the hip joint in congenital dislocation of the hip.
We report a method of monitoring hip joint development for congenital dislocation of the hip in children. The c/b ratio was measured on serial radiographs of 41 hips in 38 patients. The measurement was compared to c/b ratio obtained from normal hips. It was used to detect concentric reduction or its loss by migration of the femoral head during growth. The age at diagnosis ranged from 8 months to 10 years 6 months. The normal c/b ratio was found to change little with age. Deviation of the c/b ratio from normal in congenital dislocation of the hip resulted in a poor outcome and identified cases requiring further surgical intervention. This measurement of c/b ratio is simple and accurate, using easily determined points. The graphic display promotes critical analysis of situation and allows selection of cases at risk for treatment.
Duchess of Kent Children's Hospital at Sandy Bay, Hong Kong.
Y H
YH
Li
M
M
Hafeez
R J
RJ
Emery
J C
JC
Leong
D002648:Child; D002675:Child, Preschool; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging / Q000254:growth & development* / Q000473:pathology; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000254:growth & development* / Q000601:surgery; D006801:Humans; D007223:Infant; D008297:Male; D011859:Radiography; D012189:Retrospective Studies