What is the best way to trace the talocalcaneal angle on the lateral radiographic view of the foot in children?

Abstract

Objective: To analyze the talocalcaneous angle (TCA), traced in two different ways, in the orthostatic lateral radiographic of the feet. Methods: One hundred sixty-two feet were evaluated, 90 of normal children and 72 operated clubfeet. The children were divided according to age, sex, and laterality. The TCA was measured in two distinct ways, one using the the lines’ intersection of the long axis of the talus and calcaneous (TCA1), and another deformidaof the long axis of the talus with the line that passes by the lowest point of the calcaneous posterior tuberosity and by the lowest point of the cuboid-calcaneous (TCA2). We have performed the statistical analysis by Pearson’s linear correlation and the chi-square method. Results: There was a difference between the angular values found in the TCA1 and TCA2 in the clubfeet and in the normal feet, independent of age. Conclusions: The TCA decreased as age increased (negative correlation) in normal feet. On the other hand, in male clubfeet, it increased as age increased (positive correlation). The average values in the TCA1 and TCA2 found in the clubfeet were significantly lower than in normal feet. We did not find any statistical differences between the figures of the TCA1 and TCA2 angles in the samples, in general. The two manners to measure the TCA can be used.