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Is there a difference between the epidemiologic characteristics of hip dislocation diagnosed early and late?
J F Haasbeek1, J G Wright, D M Hedden
1Division of Orthopedic Surgery, Hospital for Sick Children, University of Toronto, Ont.
Objective:
To determine if there are epidemiologic differences between patients with early and late developmental dislocation of the hip (DDH).
Design:
A chart review.
Setting:
A university-affiliated children's hospital.
Patients:
Two hundred and forty-three children, 191 with early DDH and 52 with late DDH.
Main Outcome Measures:
Sex, side involved and prevalence of bilaterality.
Results:
There were significant differences between the two groups with respect to side involved (p < 0.0002) and bilaterality (p = 0.006) but not in relation to sex. Left-sided dislocations were predominant in the early group and right-sided dislocations in the late group. Bilaterality was more common in the late group.
Conclusion:
There is circumstantial epidemiologic evidence that late DDH may be a different entity from early DDH.