Background Planovalgus deformity of the foot is common among cerebral palsy (CP) patients. It is an upcoming topic with debate and controversy that require further studies. Many clinical studies involving arthroereisis have shown acceptable results in short- and mid-term follow-up. The aim of this work was to evaluate the outcome of arthroereisis using a conventional screw placed percutaneously across the talocalcaneal articulation for the treatment of moderate planovalgus deformity in children with CP. Methods Between 2015 and 2018, a prospective study was conducted including 23 CP patients with bilateral flexible planovalgus deformity with follow-up period ranging from 24 to 40 months (mean of 36.7 months). The radiological and clinical outcomes were assessed. The patient/parent outcome was evaluated using the Oxford Ankle Foot Questionnaire for Children (OxAFQ-C). Results The results showed statistically significant improvement in both radiological and clinical data as well as patient’s symptoms and parent’s satisfaction. Conclusion Results obtained from literature from the past decades after arthroereisis for the correction of moderate planovalgus deformity in CP patients are promising. The few studies reported on that procedure shared the same harmony with our study giving a chance to be a good alternative to joint destructive procedures. Our technique is simple, effective, economical, and minimally invasive if used in selected pediatric CP patients. Levels of Evidence Therapeutic, Level IV