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First published online September 9, 2005
Journal of Experimental Biology 208, 3475-3482 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01814

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Functional trade-offs in the limb bones of dogs selected for running versus fighting

T. J. Kemp¹, K. N. Bachus², J. A. Nairn³ and D. R. Carrier^1,*

¹ Department of Biology, University of Utah, Salt Lake City, UT 84112, USA
² Department of Orthopaedics, University of Utah, Salt Lake City, UT 84112, USA
³ Department of Material Science Engineering, University of Utah, Salt Lake City, UT 84112, USA

View larger version (25K): [in a new window]   Fig. 1. Mid-shaft cross-sectional shape of the humeri and femurs of greyhounds and pit bulls. (A) Comparison of representative mid-shaft cross sections of the humeri and femurs from a greyhound and a pit bull. In both cases, the greyhound bone is on the left. The anterior-posterior axis is oriented vertically, with anterior at the top. (B) Mean ± S.E.M. of circularity index (CI) for the mid-shaft cross sections of the humeri and femurs of four greyhounds and four pit bulls. The CI is 1 for a circular cross section and is <1 for noncircular cross sections.