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Hand weakness in Charcot-Marie-Tooth disease 1X

P J Arthur-Farraj1, S M Murphy, M Laura

  • 1MRC Centre for Neuromuscular Diseases, Department of Molecular Neuroscience, UCL Institute of Neurology and the National Hospital for Neurology and Neurosurgery, Queen Square, London, UK. p.arthurfarraj@gmail.com

Neuromuscular Disorders : NMD
|April 3, 2012
PubMed

Insights

Patients with Charcot-Marie-Tooth disease type 1X (CMT1X) often exhibit reduced hand strength. This study found that the dominant hand is weaker in CMT1X patients compared to their non-dominant hand.

Area of Science:

  • Neurology
  • Clinical Neuroscience
  • Peripheral Neuropathy

Background:

  • Previous research suggests patients with Charcot-Marie-Tooth disease (CMT) may have weaker dominant hand muscles.
  • Existing studies often analyze heterogeneous groups of CMT patients, limiting specific insights.
  • Charcot-Marie-Tooth disease type 1X (CMT1X) is a common inherited peripheral neuropathy.

Purpose of the Study:

  • To investigate hand muscle strength specifically in patients with CMT1X.
  • To determine if the dominant hand is weaker than the non-dominant hand in CMT1X.
  • To analyze electrophysiological measures in relation to hand dominance in CMT1X.

Main Methods:

  • Hand strength was assessed in 43 patients diagnosed with CMT1X.
  • Muscle strength was quantified using MRC scores for key hand muscles (first dorsal interosseous, abductor pollicis brevis).
  • Nerve conduction studies (median and ulnar nerves) were performed on both dominant and non-dominant hands.

Main Results:

  • Over half of CMT1X patients (51%) presented with a weaker dominant hand.
  • No patient exhibited a stronger dominant hand.
  • Significantly lower MRC scores and reduced median nerve compound motor action potentials were observed in the dominant hand compared to the non-dominant hand.

Conclusions:

  • The dominant hand is demonstrably weaker than the non-dominant hand in individuals with CMT1X.
  • These findings highlight a specific pattern of muscle weakness in CMT1X affecting hand dominance.
  • Further research may explore the implications of this dominant hand weakness for functional activities in CMT1X patients.

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