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Functional contribution of T1 to the brachial plexus in infants

A Fattah1, C G Curtis, A M R Agur

  • 1Division of Plastic and Reconstructive Surgery, Department of Surgery, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada. adelfattah@me.com

The Journal of Hand Surgery, European Volume
|October 12, 2011
PubMed

Insights

The T1 nerve root plays a larger role in infant upper limb movement than previously thought. This study analyzed T1

Area of Science:

  • Pediatric Orthopedics
  • Neuroscience
  • Developmental Biology

Background:

  • The function of the T1 nerve root in upper limb movement is not fully understood.
  • Classical anatomical studies suggest T1 primarily innervates small hand muscles.
  • Previous research on T1 function relied on dissection and electrical stimulation.

Purpose of the Study:

  • To investigate the functional contribution of the T1 nerve root to upper limb movements in infants.
  • To challenge the traditional understanding of T1 nerve root function.
  • To analyze the physiological activity of T1 in early post-operative brachial plexus palsy patients.

Main Methods:

  • Studied 40 infants with obstetrical brachial plexus palsy.
  • Assessed early postoperative limb movements after T1 root sparing brachial plexus reconstruction.
  • Utilized the Hospital for Sick Children active movement scale for limb movement assessment.

Main Results:

  • Infants demonstrated considerable variability in upper limb movements.
  • All upper limb movements were observed except shoulder external rotation and elbow flexion.
  • This study identified a significant physiological contribution of T1 to arm function.

Conclusions:

  • The T1 nerve root has a greater functional impact on infant upper limb movement than traditionally recognized.
  • Findings suggest T1 contributes to shoulder and elbow movements, not just hand muscles.
  • This research redefines the functional role of the T1 nerve root in pediatric brachial plexus palsy.

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