Comparative forefoot trabecular bone architecture in extant hominids
Comparative forefoot trabecular bone architecture in extant hominids
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DOI：
10.1016/j.jhevol.2010.06.006
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发表时间：
2010-08-01
影响因子：
3.2
通讯作者：
Postnov, Andrei
中科院分区：
文献类型：
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作者：
Griffin, Nicole L.;D'Aout, Kristiaan;Postnov, Andrei
古人类谱系中前脚推出机制的出现很难识别，部分原因是研究人员不同意使用外部骨骼形态来区分现存类人猿和人类的跖趾关节功能差异。在这项研究中，我们通过量化内部骨骼结构的特性来解决这个问题，这些特性可能反映了人类和类人猿跖趾关节的不同负载模式。收集了智人 (n = 26)、泛猿 (n = 17)、泛猿 (n = 19)、大猩猩 (n = 16) 和矮猿 (n = 20) 第一和第二跖骨头的高分辨率 X 射线计算机断层扫描数据。对每个跖骨头的三个区域的小梁骨结构进行了分析。虽然骨体积分数并没有显着区分人类和类人猿的骨小梁结构，但与类人猿跖骨头的相应区域相比，人类跖骨头通常表现出明显更多的各向异性骨小梁结构，特别是在背部区域。人类和类人猿之间各向异性的差异支持了这样的假设：人类跖骨背侧区域的小梁结构表明前脚在步态过程中习惯性地用于推进。这项研究为根据跖骨头小梁骨结构预测古人类化石的前脚功能和步态提供了潜在的途径。 (C) 2010 Elsevier Ltd. 保留所有权利。
The appearance of a forefoot push-off mechanism in the hominin lineage has been difficult to identify, partially because researchers disagree over the use of the external skeletal morphology to differentiate metatarsophalangeal joint functional differences in extant great apes and humans. In this study, we approach the problem by quantifying properties of internal bone architecture that may reflect different loading patterns in metatarsophalangeal joints in humans and great apes. High-resolution x-ray computed tomography data were collected for first and second metatarsal heads of Homo sapiens (n = 26), Pan paniscus (n = 17), Pan troglodytes (n = 19), Gorilla gorilla (n = 16), and Pongo pygmaeus (n = 20). Trabecular bone fabric structure was analyzed in three regions of each metatarsal head. While bone volume fraction did not significantly differentiate human and great ape trabecular bone structure, human metatarsal heads generally show significantly more anisotropic trabecular bone architectures, especially in the dorsal regions compared to the corresponding areas of the great ape metatarsal heads. The differences in anisotropy between humans and great apes support the hypothesis that trabecular architecture in the dorsal regions of the human metatarsals are indicative of a forefoot habitually used for propulsion during gait. This study provides a potential route for predicting forefoot function and gait in fossil hominins from metatarsal head trabecular bone architecture. (C) 2010 Elsevier Ltd. All rights reserved.