The Bipartient Tendency of the Articular Surface of the Trochlear Notch in the Human Ulna

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  • Yamaguchi Bin
    Department of Anatomy, Sapporo Medical College Sapporo, Japan

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An attempt was made to devise a sequent classification scheme for the widely variable bipartient tendencies of the articular surface of the trochlear notch. The proposed sequence of seven different types is shown in Fig.1.<BR>The validity of the morphological sequence of these types ranging from the non-bipartient to the completely bipartient was confirmed by examining the type combinations between the sides of the same individual skeletons.<BR>Possible sex and age dependences of the bipartient tendency were tested by two statistical analyses, revealing significant sex and age differences: stronger tendency toward bipartition in the male than in the female, and also in the higher age than in the younger.<BR>The test of the association between the bipartitional tendency of the trochlear notch and the general arthritic tendency of the entire skeleton confirmed a significant relationship between these two phenomena. This suggests a more direct association of the bipartient tendency with the general senility of the bone and joint rather than with the chronological age of individual. Much higher incidences of bipartite types in the Ainu and the Iroquoian ulnae than in the modern Japanese ulnae may be understood by such interpretation.<BR>In addition to these statistical analyses on the macerated or excavated materials, a few fresh specimens were examined histologically. The results also suggested a successive change from normal cartilaginous demarcation, through the degeneration of the cartilage and the formation of a bony tubercle, to the entire replacement of the cartilage in the demarcating portion by bone tissue in extreme senility.<BR>From anthropological point of view, the above results seem to devaluate the simple inter-populational comparison of the incidences of this trait without consideration of the age and sex compositions of the samples to be compared. However, if due considerations are paid to the age and sex factors, this trait can be a profitable subject of paleopathological study of skeletal populations.

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