Introduction: Tendo-achilliestenotomy is required as last step of ponseti method of treatment of Congenital TalipesEquinoVarus (CTEV). Not all cases require tenotomy. It is important to study the factors which predicts the need for tenotomy and to determine the outcome in cases who do not require tenotomy. Purpose: The purpose of this study 1) to determine percentage of cases requiring tenotomy, 2) to determine the factors which help in predicting the need for tenotomy, in the Ponseti method of treatment of idiopathic clubfoot under 2 year age group. Methods: This is a prospective study conducted at the Orthopaedic Surgery unit of IGGGH & PGI, Pondicherry with idiopathic club foot aged from 7days to 2 years between June 2014 to May 2016 (two years) and includes 30 childrens(40 clubfeet) having idiopathic Clubfoot, corrective cast application at weekly interval as per Ponseti protocol and were assessed with Pirani scoring system. Results: The deformity was classified, according to the Pirani scoring system into 3 groups. Majority of the patients (60%) were having pretreatment Pirani Score between 5-6. Overall mean Pirani Score for all patients was 4.9. Total of 38 (95%) of the forty clubfeet underwent a percutaneous Tendoachillestenotomy to correct a residual equinus deformity. Need for tenotomy was significantly increased in clubfeet which were more severe at presentation and more rigid. Hind foot contracture score was also related with increased need for tenotomy. Conclusion: Clubfoot can be successfully treated with Ponseti technique by serial casting. Tenotomy is not required in all cases. Severity of the deformity at presentation predict the need for tenotomy especially the hindfoot contracture score along with the rigidity of the clubfoot. Those cases requiring tenotomy and those not requiring, were well corrected at the end of casting. The outcome of both group was comparable. The need for tenotomy does not indicate poorer outcome.