innominate osteotomy for the treatment of leggcalvperthes disease a retrospective study was performed in 37 patients who underwent innominate osteotomy for the treatment of leggcalvperthes disease the majority of the patients 81 were more than 6 years old and the mean age was 7 years and 6 months thirty five hips were catterall group iii or iv and 2 hips that had clinical and radiological head at risk signs were group ii the time interval between surgery and the final followup ranged from 2 to 6 years with a mean of 3 years and 10 months twenty five of 37 patients had good clinical results and radiographs showed that the sphericity of the femoral head in the older age 8 years group was poorer which demonstrated a similar pattern to the clinical results in this age group we conclude that innominate osteotomy is a safe and effective procedure in severe leggcalvperthes disease and this operation should be carefully selected as a treatment method in the appropriate age group