Abstract
The scaling of sixteen articular dimensions in the locomotor skeleton of hominoid primates is examined with special reference to a recently proposed model of geometric similarity. Seven species are included in the analysis (gorillas, common chimpanzees, bonobos, orang-utans, siamang, lar gibbons, and modern humans of European descent); all specimens are adult individuals of known body mass (N=87). No significant sexual dimorphism in the scaling of joint size was observed. Overal results are compatible with the biomechanical model predictions of isometry, and lend additional support to the suggestion that joint stresses are of the same order of magnitude in animals differing vastly in body size and locomotor adaptations. The hindlimb and lumbosacral joints of humans, however, are consistently much larger than expected for their body mass. Full-time bipedality obviously precludes the sharing of weight support and propulsion with the forelimbs, and this fundamental difference is accurately reflected in the relative joint size of humans.
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Jungers, W.L. Scaling of postcranial joint size in hominoid primates. Hum. Evol. 6, 391–399 (1991). https://doi.org/10.1007/BF02435532
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DOI: https://doi.org/10.1007/BF02435532