Evolutionary regularity of acetabular dysplasia after reduction of developmental dislocation of the hip
Ma, R.; Ji, S.; Zhou, Y.; Liu, W.; Zhang, L.
Chinese Medical Journal 110(5): 346-348
1997
ISSN/ISBN: 0366-6999 PMID: 9594299 Document Number: 478641
Objective: To observe the developmental changes of the acetabulum after reduction of developmental dislocation of the hip and require evolutionary regularity of acetabular dysplasia. Methods: A follow-up in an average of 7.4 years was carried out in 117 patients (161 hips) with developmental dislocation of the hip after reduction. By the series of X-ray films, acetabular index, acetabular-head index, Sharp's angle, ACM angle (Idelberger's angle) and anteversion were observed. At the same time, centre-head distance discrepancy was measured. Results: Acetabular index returned to normal gradually as the time went by and significantly within one year after the reduction of developmental dislocation of the hip. The process of recovery was nearly stable three years later. Acetabular index in the dysplasia group was above 39 degree before reduction and decreased slowly after the reduction. However, it was still up to 30' after 3 years observation. The value of centre-head distance discrepancy decreased gradually as the years went by after reduction. Conclusions: If acetabular index before reduction is above 39 degree and is still up to 30 degree three years after reduction, acetabular dysplasia can be diagnosed.