Articular surface interactions distinguish dinosaurian locomotor joint poses
Articular surface interactions distinguish dinosaurian locomotor joint poses
复制标题
DOI：
10.1038/s41467-024-44832-z
复制
发表时间：
2024-02-16
影响因子：
16.6
通讯作者：
Bhullar，Bhart-Anjan S.
中科院分区：
文献类型：
--
作者：
Manafzadeh，Armita R.;Gatesy，Stephen M.;Bhullar，Bhart-Anjan S.
我们对脊椎动物功能进化的认识依赖于对灭绝类群中关节功能的推断。然而，由于没有严格的标准来评估关节，这样的分析有误导脊椎动物运动重建的风险。在这里，我们提出了一种方法，用于合成基于光线投射的测量的3-D关节重叠，对称性和一致性到一个定量的“关节评分”的任何非互穿六度的自由关节配置。我们将我们的方法应用于两种现存恐龙（豚鼠，鸸鹋）的双髁后肢关节，并通过与体内运动学的比较，发现运动关节姿势始终具有较高的关节评分。然后，我们利用这种关系来约束重建的踏板行走步幅周期灭绝的Deinonychus antirrhopus，展示了我们的方法的实用性。随着关节发音在更多活动物中的研究，我们在这里建立的框架可以扩展到容纳更多的关节和分支，促进对脊椎动物运动及其进化的更好理解。
Our knowledge of vertebrate functional evolution depends on inferences about joint function in extinct taxa. Without rigorous criteria for evaluating joint articulation, however, such analyses risk misleading reconstructions of vertebrate animal motion. Here we propose an approach for synthesizing raycast-based measurements of 3-D articular overlap, symmetry, and congruence into a quantitative “articulation score” for any non-interpenetrating six-degree-of-freedom joint configuration. We apply our methodology to bicondylar hindlimb joints of two extant dinosaurs (guineafowl, emu) and, through comparison with in vivo kinematics, find that locomotor joint poses consistently have high articulation scores. We then exploit this relationship to constrain reconstruction of a pedal walking stride cycle for the extinct dinosaurDeinonychus antirrhopus, demonstrating the utility of our approach. As joint articulation is investigated in more living animals, the framework we establish here can be expanded to accommodate additional joints and clades, facilitating improved understanding of vertebrate animal motion and its evolution.