Non‐circular geometry and radiogrammetry of the second metacarpal

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Abstract
Traditional radiogrammetry of the second metacarpal mid-shaft reconstructs cortical cross-sectional geometry from mediolateral (ML) linear dimensions based on a circular model. However, comparison of antero-posterior (AP) versus mediolateral radiographic dimensions in a sample of paired metacarpals shows that AP total and medullary widths typically exceed ML widths by 5% to 10%. As well, in 13% of males and 25% of females, the two metacarpals are dissimilarly shaped, i.e., the AP/ML ratio is >1.0 for one side and <1.0 for the other. This situation exaggerates the differences in geometric properties between sides and constitutes a potentially significant source of bias for analyses of bilateral asymmetry. These results suggest that the circular model is inappropriate for estimation of cross-sectional geometry at this anatomical location.

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