Roentgenograms of 17 healthy adults' feet were taken in using Cobey's poterior view in a standing position. Medial and lateral wedge arch support were used. The medial side's degrees were 5, 10, 15, 20, and lateral side's degrees were 5, 10. In all roentgenograms we measured Ankle mortise-heel contact angle (A-H angle) and Tibiocalcaneal angle (TB-C angle). On the inversion side the mean A-H angle was 9.3, 7.7, 6.3, 5.6, 4.0 in 0, 5, 10, 15, 20, respechvely and mean TB-C angle was 1.7, 3.6, 6.4, 9.2, 11.5 in 0, 5, 10, 15, 20 respechvely. There was a significant relationship between degree of arch support and A-H angle or TB-C angle. On the eversion side, the mean A-H angle was 9.3, 8.6, 9.0 in 0, 5, 10, respechvely and that of TB-C angle was 1.7, 1.0, 1.2 in 0, 5, 10 respectively. There was no significant relationship between degree of arch support and A-H angle or TB-C angle. However the TB-C angle can distinguish the eversion side from that of the control or inversion side.
