1975 Volume 25 Issue 1 Pages 37-64
As to X-ray examination of the naviculare and tibiale externum bones, the authors worked out a way to project them obliquely as follows; A new X-ray projection technique for taking shots anteversio oblique at an angle of 28 degrees to the footbottom. The reason for determining the angle at 28 degrees is that it corresponds to the degree at which the space between the tibiale externum and naviculare can be most clearly projected. It was the average degree out of 21 samples taken. Using this oblique projection technique, the space along these two bones does not overlap and its shadow is projected sharply.
The figures of the naviculare and the tibiale externum of 540 adults (25-74 years old) on roentogenograph by means of such oblique projection are now classified as the Oneda-Katada classification in 6 divisions (A', A, B, C, D and E types) and 2 subdivisions (+S1, or +S2 and L, M, or S types) (cf. Figs. 8 and 9 and Tables 2, 3 and 4), referred to the dorso-plantar X-ray projection figures.
Further, using this oblique projection method, the authors classified the both bones of 1, 159 growing children from age 6-19 years old (cf. Tables 5, 6 and 7). It was concluded that the frequency of occurrensce of each type was about one or two years earlier for the female than for the male. Due to the frequency of occurrence of each type in each age group, the growth of the naviculare and the tibiale externum is assumed by the authors to be as Fig. 11.
It must by assumed therefore, that in some cases growth ceases in each type and that the bones remain unchanged.
