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Related Experiment Videos

Lower median nerve block impairs precision grip.

Shouchen Dun1, Robert A Kaufmann, Zong-Ming Li

  • 1Hand Research Laboratory, Department of Orthopaedic Surgery, University of Pittsburgh, E1641 Biomedical Science Tower, 210 Lothrop Street, Pittsburgh, PA 15213, USA.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|April 18, 2006
PubMed
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A median nerve block at the wrist significantly impairs precision grip, increasing grip force safety margin, variation, and center of pressure migration. This highlights sensory function

Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Median nerve neuropathy can affect hand function.
  • Precision grip relies on sensory feedback for fine motor control.

Purpose of the Study:

  • To investigate how a median nerve block at the wrist impacts precision grip tasks.
  • To simulate acute median neuropathy and assess its effects on grip control.

Main Methods:

  • A lower median nerve block was induced using bupivacaine hydrochloride in healthy male subjects.
  • Precision grip tasks (grip, lift, hold) were performed before and after the nerve block.
  • Force and torque data were collected using 6-component force/torque transducers to quantify grip parameters.

Main Results:

Related Experiment Videos

  • The median nerve block significantly increased grip force safety margin (>50%), grip force variation (>80%), and center of pressure migration area (>250%).
  • Two subjects were unable to complete tasks post-nerve block, indicating severe impairment.
  • These findings demonstrate impaired fine motor control following median nerve blockade.

Conclusions:

  • Median nerve block at the wrist impairs fine motor control during precision grip.
  • Sensory function is crucial for effective hand motor control.
  • Precision grip measures can quantify hand function deficits in neuromuscular disorders and monitor treatment efficacy.