The treatment of chronic mallet finger deformities in children can be challenging. Previously proposed for the treatment of chronic mallet fingers in adults, tenodermodesis is a reconstructive procedure that may also be applied to the pediatric population. The technique of tenodermodesis for chronic mallet finger injuries in children is presented here, featuring careful repair of the extensor mechanism and temporary transarticular Kirschner wire fixation of the distal interphalangeal joint. Preliminary clinical results with this procedure have been encouraging, with high patient/parent satisfaction and few complications. Most importantly, tenodermodesis allows anatomical reconstruction of the injured extensor mechanism while preserving skeletal growth and distal interphalangeal joint motion in children and adolescents.