BACKGROUND: Hip dysplasia affects 1% of newborns. Our health system sc
reening begins at birth, and our educational system requires health sc
reens at various ages, so physicians in this country rarely find an ad
ult with an undiagnosed congenital condition. CASE: Bilateral hip disl
ocation Teas diagnosed on a 20-year-old, nulliparous woman who had jus
t arrived from Puerto Rico. She tolerated her abnormal gait well, unaw
are of the condition of her hips. After an unremarkable prenatal cours
e, she was admitted at term with ruptured membranes for stimulation of
labor. She developed secondary arrest of labor, and a healthy, 3,180-
g, female infant was delivered by cesarean. CONCLUSION: In hip dysplas
ia, early diagnosis (and therapy) prevents long-term consequences.