RESUMEN
<p><b>OBJECTIVE</b>To assess the effect of total hip replacement on lumbago in patients with unilaterally developmental hip dysplasia.</p><p><b>METHODS</b>From January 2001 to January 2006, 39 adult patients with unilateral developmental hip dysplasia co-exiting lumbago were included. Among them, there were 32 females and 7 males, age from 38 years to 73 years. According to Crowe classification system, there were 4 in type I, 20 in type II,8 in type III and 7 in type IV. They were performed total hip replacement. The Harris Hip Score and the Oswestry Disability Index were used to evaluate hip and spine symptoms in same patient before and 3, 24 months after operation.</p><p><b>RESULTS</b>Thirty-nine patients were evaluated, both hip and spinal pain and function were significant improved. The mean Harris score increased from 44 to 84 (P < 0.01). The mean Oswestry Scores dropped from 36 to 25 (P < 0.01).</p><p><b>CONCLUSION</b>Spinal function and lumbago is improved after total hip replacement in patients with unilateral developmental hip dysplasia at 3 months, which is maintained and enhanced in 2 years.</p>