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Densities in Hounsfield units (HU on the external surface of an adult ostrich left tarsometatarsus, reconstructed in proximal (A) and distal (B) views. Note bone density at joint surfaces is significantly less dense then that at the shaft. Abbreviations: CL = cotyla lateralis, CM = cotyla medialis, H = hypotarsus, TM III = trochlea metatarsi III, TM IV = trochlea metatarsi IV. Finite element constraints: CM, CL.
