Reference - Detail
| RRC ID | 85039 |
|---|---|
| Author | Ito A, Oishi M, Endo H, Hirasaki E, Ogihara N. |
| Title | A cadaveric study of wrist-joint moments in chimpanzees and orangutans with implications for the evolution of knuckle-walking. |
| Journal | J Hum Evol |
| Abstract |
Understanding the mechanism underlying the evolution of knuckle-walking in African great apes but not in humans may provide important implications about the origin and evolution of human bipedal locomotion. In this study, aiming to reveal possible structural adaptations of the chimpanzee's forearm and hand musculature related to knuckle-walking, we measure the passive elastic moment of the chimpanzee's and orangutan's wrist as it was rotated into extension, immobilizing the metacarpophalangeal joint at three different positions: extended (as in knuckle-walking), flexed (as in fist-walking), and an intermediate position. Our findings demonstrate that when the metacarpophalangeal joints are extended, the rigidity of the wrist joint in the extended direction increases. This increased rigidity is attributed to the passive elongation and force generation of digital flexor muscles, which are relatively short in chimpanzees. Consequently, this enhanced wrist-joint rigidity contributes to the stability and energetically efficient transmission of propulsive force to the ground during the stance phase. Overall, our study supports the hypothesis that knuckle-walking is an adaptation to terrestrial locomotion for an ancestor characterized by the restricted capacity for wrist extension owing to the relatively shorter tendons of digital flexor muscles. |
| Volume | 197 |
| Pages | 103600 |
| Published | 2024-12-1 |
| DOI | 10.1016/j.jhevol.2024.103600 |
| PII | S0047-2484(24)00108-8 |
| PMID | 39471655 |
| MeSH | Animals Biological Evolution* Biomechanical Phenomena Cadaver Female Male Pan troglodytes* / physiology Pongo / physiology Walking* / physiology Wrist Joint* / anatomy & histology Wrist Joint* / physiology |
| Altmetric score |
オルトメトリクス指標項目
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| The most frequently cited source | X(Twitter) |
| Total number of mentions | 3 |
| Altmetric score changes over past 6months | 0.0 |
| Resource | |
| GAIN | id=157 id=399 id=226 id=485 id=359 id=452 id=505 id=440 id=398 |