ArticleJournal of biomechanics2025
A normative dataset of thumb muscle fascicle lengths in healthy, young adults: an extended field-of-view ultrasound study.
Article in Journal of biomechanics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Benchmarking Neural Network Personalized Musculoskeletal Hand Models Against Current Personalization Standards Using Experimental Magnetic Resonance Imaging and Fine-Wire Electromyography.IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society · 2026Article
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Abstract
Understanding in vivo thumb muscle architecture is essential for advancing musculoskeletal modeling and identifying deviations linked to pathologies. As thumb muscle architecture has primarily been studied in cadavers, the objective of this study was to establish normative data on thumb muscle fascicle lengths in a young, healthy population using extended field-of-view ultrasound (EFOV-US). Six thumb muscles [abductor pollicis brevis (APB) and longus (APL); extensor pollicis brevis (EPB) and longus (EPL); flexor pollicis brevis (FPB) and longus (FPL)] and one wrist extensor [extensor carpi ulnaris (ECU; for comparison purposes only)] were imaged in 18 healthy adults (8 female; age: 22.7 ± 2.0 years; height: 172.1 ± 8.8 cm; weight: 79.0 ± 16.5 kg) [mean ± SD]. Measured fascicles were compared to cadaveric data (all thumb muscles) and ultrasound data (APB, ECU, FPL). Mean fascicle lengths (±SD) were 6.5 ± 0.8 cm (FPL), 3.8 ± 0.4 cm (APL), 4.7 ± 0.5 cm (EPL), 3.7 ± 0.5 cm (EPB), 4.5 ± 0.5 cm (APB), 3.6 ± 0.4 cm (FPB), and 4.2 ± 0.5 cm (ECU). The consistency of our measurements is indicated by the small standard deviations within (±0.1 to ± 0.7 cm) and across (±0.4 to ± 0.8 cm) participants. Measurement repeatability is high, as demonstrated by low coefficients of variation (range: 0.04-0.08) for the measured thumb muscles. We also examined to what extent anthropometric measurements can be used to predict fascicle lengths and found some significant relationships; however, these relationships were not consistent across all muscles. This study importantly expands our understanding of the complex anatomy of the healthy thumb and provides normative data for future work evaluating hand pathologies.
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