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Related Experiment Video

Updated: Jan 21, 2026

Measurement of Spatial Stability in Precision Grip
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Electromyographic Analysis of Grip.

Paige M Fox, Jeremie D Oliver, Viet Nguyen

    Orthopedics
    |August 14, 2019
    PubMed
    Summary
    This summary is machine-generated.

    The flexor digitorum profundus is key for fist formation. However, flexor digitorum superficialis and intrinsic muscles show varied recruitment patterns, especially in injured patients during finger flexion analysis.

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    Area of Science:

    • Biomechanics
    • Neuroscience
    • Orthopedics

    Background:

    • Understanding finger flexion dynamics is crucial for diagnosing and treating hand injuries.
    • Extrinsic and intrinsic muscles play complex roles in grasp.
    • Video electromyography (EMG) offers insights into muscle activation patterns.

    Purpose of the Study:

    • To dynamically analyze the recruitment of extrinsic and intrinsic finger flexor muscles during different grasp formations.
    • To investigate variations in muscle activation patterns, particularly in patients with hand injuries.

    Main Methods:

    • A prospective cohort study utilizing synchronized video electromyography (EMG).
    • Analysis focused on dynamic muscle recruitment during light and tight fist formations.
    • Muscle activity patterns were correlated with injury types.

    Main Results:

    • Flexor digitorum profundus is consistently recruited during composite fist formation.
    • Flexor digitorum superficialis and intrinsic muscles are recruited in tight fist formation, with variable sequencing.
    • Injured patients exhibited unique, injury-specific muscle recruitment patterns.

    Conclusions:

    • Flexor digitorum profundus is the primary muscle for composite fist formation.
    • The roles of flexor digitorum superficialis and intrinsic muscles are variable and less consistent.
    • Muscle recruitment patterns provide insights into functional deficits post-injury.