The main difference in our study is the method of radiography; we used H-to-C methods  in order to measure FTA and THFA in one X-ray film.
Moreover, the difference of the mean pain score between the hindfoot preserve and hindfoot affected patients became larger as the THFA alignment became varus from valgus.
In the right radiograph, there is an enlargement of the left radiograph, the THFA, which is the internal angle of the tibial axis (solid white line).
Caption: Figure 2: The correlation between FTA and THFA of (a) all patients in this cohort, (b) hindfoot preserved patients (Larsen grade of both talocrural subtalar joints < 2), (c) talocrural joint preserved (Larsen grade < 2) but subtalar joint affected (Larsen grade > 3), and (d) both talocrural and subtalar joints affected (Larsen grade > 3) is shown.
Caption: Figure 3: The correlation between Talo-1st MTA and THFA of (a) and the correlation between calcaneal pitch and THFA (b) are shown.