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Background: Percutaneous Achilles tenotomy (PAT) is an important component of the Ponseti method and is performed in 85% to 90% of patients. However, there is a lack of objective data assessing early radiographic changes in children undergoing PAT. Methods: Forty-nine patients with idiopathic clubfoot treated by Ponseti casting were prospectively enrolled between October 2017 and October 2018. Preoperative and postoperative ankle dorsiflexion (pre-ADFmax, post-ADFmax) and lateral talocalcaneal angle (pre-LTCAmax, post-LTCAmax) values with the ankle in maximal dorsiflexion as well as postoperative LTCA values with the ankle in the neutral position (post-LTCAneutral) were measured. The relationship between the preoperative and postoperative ADF and LTCA values was studied using Pearson or Spearman correlation coefficients. Forty-nine patients (72 feet) were included; the mean age at initial treatment was 32.2 ± 24.1 days. Results: Post-LTCAmax improved significantly from 18.6 ± 9.2 degrees to 25.1 ± 10.5 degrees (P <.0001). Pre-ADF and pre-LTCAmax showed a positive correlation in both the less than 28-day group (r = 0.42; P =.015) and the Dimeglio III group (r = 0.29; P =.035). However, post-ADF and post-LTCAmax showed a positive correlation in the Dimeglio III group (r = 0.30; P =.028). The degree of improvement in post-LCTAmax in the Dimeglio III group was similar to that in the Dimeglio IV group (P =.28). Conclusion: The LTCA increased immediately after PAT in clubfoot, although the improvement seemed to be unrelated to the severity of the disease. PAT led to an increase in both ADF and the LTCA, and it contributed to the improvements in subtalar joint motion and alignment. Level of Evidence: Level III, comparative study. [ABSTRACT FROM AUTHOR]