ABSTRACT
<p><b>OBJECTIVE</b>To explore factors influencing acetabular development after closed reduction in developmental dislocation of the hip (DDH), to provide theoretical basis for improving the therapeutic effects of closed reduction treatment of DDH.</p><p><b>METHODS</b>A total of 100 children with single side DDH who were treated by closed reduction from January 2002 to December 2005 were followed up, and the AI and AI (D/W) of dislocation hip were measured at the 12th month after reduction. Ten factors such as gender, side, age, AI and AI (D/W) of dislocation hip before reduction, degree of dislocation, the rate of width of femoral head, femoral neck anteversion of dislocation hip before reduction, h/b rate,cut off adductor and skeletal traction et al were taken as independent variable, AI and AI (D/W) at the 12th month after reduction were taken as dependent variable,then multiple linear stepwise regression analysis was used to screen the major influencing factors.</p><p><b>RESULTS</b>Age, gender, degree of dislocation, h/b rate, the rate of width of femoral head and femoral neck anteversion exerted obviously influence on AI and AI (D/W),and then age,degree of dislocation and FNA had positive correlation with AI and negative correlation with AI (D/W); the rate of width of femoral head and h/b rate had negative correlation with AI and positive correlation with AI(D/W). The development of acetabular of female patients was faster than that of male patients.</p><p><b>CONCLUSION</b>Age, gender,degree of dislocation, concentric reduction or not, the development degree of femoral head before reduction and proximal femoral shape are the major factors influencing acetabular development.</p>