142 LABORATORY MANUAL OF ANTHROPOMETRY 



II. INDICES 



, breadth across sustentaoulum X 100 



1. Length-breadth index A (2 : 1) - -. 



maximum length 



_ T , , . , . . least breadth of body X 100 



2. Lenqth-breadth index R (3 : 1) -- : - \ *rr - 



maximum length 



/ a i, i* j />i i\ height of body X 100 



3. Length-height index (4:1) - = 



maximum length 



,L j in 1N length of the body (heel length) X 100 

 4.- Calcar length index (5 : 1) - r- = *-: 



maximum length 



rx breadth of the tuber X 100 



5. T liberal index (8:7) - rr f ., 



length of the tuber 



6. Index of the posterior articular facet (10 : 9)* 



breadth of post. art. facet X 100 



length of post.' art. facet 



III. ANGLES 



1. Angle of inclination of the posterior articular facet; this is the angle 

 between the longitudinal axis of the facet in question and that of the 

 bone as a whole (cd and ef of Fig. 42). It is taken by fixing steel needles 

 in the proper places and reading the result by means of a protractor. 



2. Talo-calcaneus angle; this is an angle involving the relative position 

 of the two bones considered, and differences in it are indicative of differ- 

 ences in the habitual position, and consequently in the use, of the foot. 

 It is really the angle formed between the longitudinal axis of the calcaneus 

 and that of the talus, through the trochlear trough, but is best obtained 

 by subtracting the angle of inclination of the posterior facet of the talus 

 from the corresponding angle on the calaneus (angle 3 of the talus from 

 angle 1 of the calcaneus) . This procedure assumes a complete coincidence 

 of the two posterior facets with their longitudinal axes, from which the 

 varying longitudinal axes of the two bones are laid off at definite though 

 different angles. The difference between these two, as measured from the 

 same plane, is the value of the angle sought. 



The Other Tarsal Bones. 



The remaining tarsal bones, especially cuboid and naviculare, have 

 been subjected to certain special anthropometrical measurements, upon 

 lines similar to those already laid down for the others. These consist 

 of lengths, breadths, and heights, the axes of important articular facets, 

 also indices expressing the relationships of these. The two first-men- 



* Besides the above there have been used (1) the index between the length of the 

 sustentaculum and the breadth of the entire region, and (2) the length and breadth 

 of the cuboid articulation, with the index between them. The first would seem to 

 require an almost impossible accuracy in the length measurement; the latter is too 

 uncertain in many ways. However, these results may be consulted in the original 

 paper, above referred to. 



