The objective of this study was to evaluate the operative management of flexible flatfoot in children by calcaneal lengthening osteotomy described by Evans. Fifteen children (11 girls and 4 boys) with average age 11 years 4 months (range, 6 years 2 months to 13 years 4 months) with 25 idiopathic symptomatic flexible flatfeet were included in this study. Clinical evaluation was made according to Dogan's scale and graded as perfect, good, fair and poor. Preoperative and postoperative radiological assessment of anteroposterior talo-first metatarsal angle (AP-T1MT), laterl Talo-first metatarsal angle (Lat. T1MT), lateral Talohorizontal angle (Lat. TH), and lateral Calcaneal pitch angle (Lat. CP) had been done for all feet. All flatfeet were corrected with modification of the calcaneal lengthening osteotomy described by Evans. - Clinical results were perfect in 20 feet (80%), good in 4 feet (16%) and poor in 1 foot (4%). Radiological results showed improvement in 23 feet, while 2 feet showed no improvement. The improvement was significant in Lat. T1MT and Lat. CP (P < 0.001, < 0.001 respectively) whereas it was insignificant in AP-T1MT and Lat. TH (P > 0.05). There was good agreement between clinical and radiological results (Kappa test 0.64).-The results of the present study showed that a successful proposed combined procedure reliably relieves pain in symptomatic flexible flatfoot in children as young as six years old, and proved effective in addressing all components of the deformity in both hind foot and forefoot clinically and radiographically. The need for arthrodesing procedures in adulthood can be eliminated.