In this study, early and late results of heterotopic splenic autotransplantation in 18 children with type IV splenic injuries (Upadhyaya-Simpson classification) are presented. Splenic scintigrams, quantitative analysis of Howell-Jolly inclusion bodies, immunoglobulin (IgG, IgM, IgA) and complement C3 levels and T and B lymphocyte counts were analysed in the postoperative evaluation of the autotransplantation group. The total follow-up period was 7 years. According to our results, splenic implants increased complement C3 levels and improved filtration function of the splenectomized children. This autotransplantation group has two important characteristics: a) it is one of the largest series of the literature (pediatric age group), with b) longest follow-up period.