Predictive ability of scoring systems towards casting in treatment of idiopathic clubfoot by the Ponseti method in infants.

A prospective study to find a correlation between the severity of clubfoot and the number of casts required for the correction was conducted. The relationship of early relapse with the severity of the deformity was also studied. A total of 42 infants (61 feet) with primary and idiopathic clubfeet were included in the study. Previously treated and clubfeet due to secondary causes were excluded. All clubfeet were treated by the Ponseti method, and the Pirani score, Dimeglio score and Foot Bimalleolar (FBM) angle were taken at presentation and before every casting and at 6 months of follow-up. The average age of the child at presentation was 24 days, the average initial Pirani score was 4.172, the average initial Dimeglio score was 14.36 and the average FBM angle was 63.87 degrees. The average number of corrective casts given was 5.08 (range 2-8). The regression analysis showed a low correlation between Pirani and Dimeglio scores with the number of casts. There was no correlation between FBM angle and casting. Eleven of the 61 feet had a relapse (18%). Ten of 11 relapsed feet had a midfoot Pirani score of equal to or more than 2. The regression analysis shows a low correlation between Pirani and Dimeglio scores with the number of casts. There was no correlation between FBM angle and casting. Midfoot score equal to or more than 2 is a significant risk factor for relapse.