Institute of Biomedical Engineering, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China.
Department of Ultrasound, Shanxi Bethune Hospital,Taiyuan, Shanxi, China.
PLoS One. 2022 May 11;17(5):e0268137. doi: 10.1371/journal.pone.0268137. eCollection 2022.
Fine hand movements require the synergistic contraction of intrinsic and extrinsic muscles to achieve them. In this paper, a Finite Element Digital Human Hand Model (FE-DHHM) containing solid tendons and ligaments and driven by the Muscle-Tendon Junction (MTJ) displacements of FDS, FDP and ED measured by ultrasound imaging was developed. The synergistic contraction of these muscles during the finger flexion movements was analyzed by simulating five sets of finger flexion movements. The results showed that the FDS and FDP contracted together to provide power during the flexion movements, while the ED acted as an antagonist. The peak stresses of the FDS, FDP and ED were all at the joints. In the flexion without resistance, the FDS provided the main driving force, and the FDS and FDP alternated in a "plateau" of muscle force. In the flexion with resistance, the muscle forces of FDS, FDP, and ED were all positively correlated with fingertip forces. The FDS still provided the main driving force, but the stress maxima occurred in the FDP at the DIP joint.
精细的手部动作需要内在和外在肌肉的协同收缩来实现。本文开发了一种包含固有肌腱和韧带的有限元数字人手模型（FE-DHHM），并通过超声成像测量 FDS、FDP 和 ED 的肌肌腱结合点（MTJ）位移来驱动该模型。通过模拟五组手指弯曲运动，分析了这些肌肉在手指弯曲运动中的协同收缩。结果表明，FDS 和 FDP 在弯曲运动中共同收缩提供动力，而 ED 则作为拮抗剂。FDS、FDP 和 ED 的峰值应力均在关节处。在无阻力的弯曲中，FDS 提供主要驱动力，FDS 和 FDP 在肌肉力的“平台”中交替。在有阻力的弯曲中，FDS、FDP 和 ED 的肌肉力均与指尖力呈正相关。FDS 仍然提供主要驱动力，但在 DIP 关节处 FDP 的最大应力出现。
