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Related Experiment Videos

Ligamentomuscular protective reflex in the elbow

D Phillips1, S Petrie, M Solomonow

  • 1Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans 70112, USA.

The Journal of Hand Surgery
|May 1, 1997
PubMed
Summary

A newly discovered reflex arc connects elbow ligaments to forearm muscles in felines, confirming ligamentomuscular protective synergy and impacting elbow surgery and rehabilitation.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Orthopedics

Background:

  • Ligamentomuscular protective synergy is established in major joints like the knee, shoulder, and ankle.
  • The existence and function of such reflex arcs in the elbow joint remained uncharacterized.

Purpose of the Study:

  • To investigate the existence of a reflex arc between medial elbow ligaments and forearm muscles.
  • To characterize the neural pathways and functional properties of this potential reflex arc.

Main Methods:

  • A feline model was used to identify and stimulate an articular nerve branch connected to the medial collateral ligament.
  • Electromyography recorded muscle activity in response to nerve stimulation.
  • Nerve transection was performed to confirm the afferent nature of the pathway.

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Main Results:

  • Stimulation of the articular nerve elicited rapid myoelectric activity in five forearm muscles (flexor digitorum superficialis, flexor digitorum profundus, flexor carpi radialis, flexor carpi ulnaris, and pronator teres).
  • Transection of the articular nerve abolished this activity, confirming its afferent role.
  • The time delay from stimulus to muscle response ranged from 3.2 to 5.8 ms.

Conclusions:

  • A fast-acting reflex arc exists between medial elbow ligaments and forearm muscles, extending the concept of ligamentomuscular protective synergy to the elbow.
  • This finding has significant implications for surgical planning to preserve neural supply and for developing post-surgical rehabilitation strategies.