RESUMO
To investigate the incidence and the causes of redislocation after different operative corrections of the developmental dysplasia of the hip and its relations to age of the patients. It was a prospective observational study during five year period between July 2000 to August 2005. Forty seven patients were admitted for corrective operation of the developmental dysptasia of the hip and a total of 59 hip surgeries have been done in our centre at Razi hospital, Ahwaz Jondishapour University of Medical Sciences, Iran. The rate and causes of redislocation in relation to the type of operation and age of these patients was recorded and analysis of the data was done by T-test and the P-values of less than 0.005 considered as a significant difference. Nine out of 59 operations redislocated after beginning of weight bearing. It included mostly in those who had adductor tenotomy, femoral shortening, derotation and Salter innominate osteotomy [P<0.05]. We conclude that if Salter innominate osteotomy is necessary after open reduction and femoral shortening in patients with developmental dysplasia of the hip, it is better not to perform femoral derotation