Fig. 3

Anteroposterior and lateral X-ray images at weight-bearing position before the operation (A–C) T1MA of 6.1°, TNCA of 10.3°, Meary’s angle of 12.9°, and pitch angle of 17.1°. X-ray at Saltzman position before the operation showed evident valgus of right calcaneus, and CVA was 12°. Postoperative X-ray images showed that the arch was restored (D–F), T1MA was 4.4°, TNCA was 5.5°, Meary’s angle was 5.4°, and pitch angle was 20.3°. Preoperative X-ray images at Saltzman position show corrected deformity of the right foot, and the CVA was 3° (F). The numbers 1, 2, 3, 4, and 5 indicated TNCA and T1MA on the anteroposterior X-ray image at weight-bearing position, Meary’s angle, pitch angle on the lateral X-ray image at weight-bearing position, and calcaneus valgus on the X-ray image of Saltzman position. The normal range of the five imaging measurements: T1MA 0°–20°, average 7.7°, TNCA less than 7°, Meary’s angle ± 4°, pitch angle 20°–30° and CVA less than 5°