Analysis on synergistic cocontraction of extrinsic finger flexors and extensors during flexion movements: A finite element digital human hand model

Lv, Ying; Zheng, Qingli; Chen, Xiubin; Hou, Chunsheng; An, Maozhu

doi:10.1371/journal.pone.0268137

Cited by 1 publication

(4 citation statements)

References 39 publications

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“…The human carpal tunnel area includes tendons, ligaments, muscles, bones, nerves and others [37]. Thus, the application of the FEM was focused on studying the stress-strain state of all these tissues [38][39][40][41][42][43][44][45][46][47][48][49]. The transverse ligament is the upper arch of the carpal tunnel.…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…[41] considered a 3D-printed scaffold for scapholunate ligament reconstruction. It is also good to look at the studies where researchers have created complex models of the carpal tunnel, tendons and fingers [40,43,46,50]. Mouzakis et.…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…al. [43] also developed a complex 3D finite element model based on MRI images. Their geometric model included 29 bones, such as 14 phalanges, 5 metacarpals, 8 carpal bones and parts of the flexor pollicis longus, extensor pollicis longus, extensor pollicis brevis, extensor indicis and extensor indicis minimi; ligaments, such as the extensor retinaculum, flexor retinaculum, and annular ligaments that act as finger pulleys at the Interphalangeal (IP) joints and Metacarpophalangeal (MCP) joints ulna and radius; 9 muscles and their tendons, such as the FDS, FDP, ED, flexor pollicis brevis.…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…al. in their studies[43,46] determined the stress in the tissues of the carpal tunnel also by the finite element method. Mouzakis et.…”

mentioning

confidence: 99%

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A coupled electro-mechanical approach for early diagnostic of carpal tunnel syndrome

Peshin

Karakulova

Kuchumov

2023

Preprint

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Carpal tunnel syndrome (CTS) is a pathology affecting hand function caused by median nerve overload. Numbness in the fingers, a loss of sensory and motor function in the hand, and pain are all symptoms of carpal tunnel syndrome. The lack of numerical data about the median nerve mechanical strain inside the carpal tunnel is the main disadvantage of current clinical approaches employed in carpal syndrome diagnostics. Moreover, application of each diagnostic method alone often leads to misdiagnosis. We proposed a combined approach including hand motion capture, finite element modelling (FEM), and electromechanical simulations to evaluate median nerve compression and find a correlation with hand mobility. The hand motion capture provided the boundary conditions for FEM. After that, FEM simulations of finger flexion and hand flexion / extension were performed. Further, FEM results were put in the electrical model of nerve conduction based on the Hodgkin-Huxley model and extended cable equation. It was exhibited median nerve conduction reduced significantly throughout the flexion and extension of the hand that compared to finger flexion. During finger flexion and hand flexion and extension, the load distribution over each of nine finger flexor tendons was evaluated. The tendons of the index finger were found to have the highest Mises stress values. It was found how tendon and connective tissue contact types affected carpal tunnel pressure. The difference between the contact types was 31.7% for hand extension and 59.9% for hand flexion. The developed approach has the potential to become an alternative diagnostic method for CTS at early stages. Additionally, it can be employed as non-invasive procedure for evaluation of carpal nerve stress.

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