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Reaffirming the link between chronic phantom limb pain and maintained missing hand representation.

Sanne Kikkert1, Heidi Johansen-Berg1, Irene Tracey2

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Summary

Phantom limb pain (PLP) is linked to the brain

Keywords:
AmputeesMotor controlNeuroimagingNeuropathic painPlasticity

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Area of Science:

  • Neuroscience
  • Pain Research
  • Neuroplasticity

Background:

  • Phantom limb pain (PLP) is often attributed to maladaptive brain plasticity.
  • A prominent model suggests PLP arises from reorganization in the primary somatosensory cortex, involving loss of the missing limb's representation and remapping of other body parts.

Purpose of the Study:

  • To investigate the relationship between chronic phantom limb pain and neural representation in the primary sensorimotor cortex.
  • To determine if lip representation remapping occurs in the missing hand's cortical territory.
  • To explore factors that may confound the association between PLP and cortical representation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure neural responses in unilateral upper-limb amputees during phantom hand, lip, and other body part movements.
  • Correlation analysis was performed between the severity of chronic PLP and brain activity in the primary sensorimotor cortex.
  • The influence of non-painful phantom sensations and prosthetic use on PLP was assessed.

Main Results:

  • Chronic PLP severity positively correlated with maintained representation of the missing hand in the primary sensorimotor cortex.
  • No evidence of lip representation remapping into the missing hand's cortical area was found.
  • This correlation persisted even when accounting for non-painful phantom sensations and prosthesis use.

Conclusions:

  • The findings support a link between persistent peripheral inputs related to the missing hand representation and chronic PLP.
  • Further research into the role of peripheral inputs from residual nerves is crucial for understanding PLP mechanisms.