Ih. Chen et al., PROGNOSTICATING FACTORS IN ACETABULAR DEVELOPMENT FOLLOWING REDUCTIONOF DEVELOPMENTAL DYSPLASIA OF THE HIP, Journal of pediatric orthopedics, 14(1), 1994, pp. 3-8
A number of predictors that may influence acetabular development after
reduction were studied in 75 hips with developmental dysplasia of the
hip (DDH). Seventy-nine percent of the hips had satisfactory results
of Severin group I or II, and 21% had unsatisfactory results. The best
predictor of success in a unilateral case is the center-head distance
discrepancy (CHDD) measurement at 1 year follow-up. Ninety-six percen
t of hips with a CHDD of less-than-or-equal-to 6% had satisfactory res
ults, whereas 78% with a CHDD >6% had unsatisfactory results. This stu
dy also confirms that age at reduction and significant improvement in
the acetabular index in the first year after reduction are important p
redictors.