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Normalized activation in the somatosensory cortex 30 years following nerve repair in children: an fMRI study

Anette Chemnitz1, Andreas Weibull2, Birgitta Rosén1

  • 1Department of Clinical Sciences Malmö - Hand Surgery, Lund University, Skåne University Hospital, SE - 20502, Malmö, Sweden.

The European Journal of Neuroscience
|April 14, 2015
PubMed

Insights

Children with median nerve injuries recover better due to distinct brain activity patterns. This study used functional magnetic resonance imaging (fMRI) to compare brain responses in patients injured at different ages, revealing key differences in cortical activation and hemisphere involvement.

Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Medical Imaging

Background:

  • Peripheral nerve injuries in the upper extremity generally have better clinical outcomes in younger individuals compared to adolescents and adults.
  • The underlying biological mechanisms driving this age-related difference in recovery are not well understood.

Purpose of the Study:

  • To investigate the relationship between age at injury, brain cortical activation patterns, and clinical outcomes in patients with complete median nerve injuries.
  • To explore the neural mechanisms underlying superior recovery in younger patients.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) at 3 Tesla was used to monitor cortical activation during tactile finger stimulation in 28 patients with median nerve injuries.
  • Patients were grouped by age at injury (1-13 years vs. 14-20 years).
  • fMRI results were correlated with clinical outcomes and electroneurography findings.

Main Results:

  • Cortical activation patterns differed significantly based on age at injury.
  • Patients injured at a younger age (1-13 years) exhibited activation patterns similar to healthy controls and had significantly superior clinical outcomes.
  • Adolescents injured later (14-20 years) showed more extensive contralateral hemisphere activation and reduced ipsilateral hemisphere inhibition, which correlated with poorer sensory recovery.

Conclusions:

  • Cerebral changes in both hemispheres play a crucial role in determining clinical outcomes after median nerve injuries during childhood and adolescence.
  • Age-dependent alterations in brain plasticity and interhemispheric communication may underlie differential recovery trajectories.

Keywords:
MRIcortical plasticityfunctional recoveryperipheral nerve injury

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