Myopathies with finger flexor weakness: Not only inclusion-body myositis

Stefan Nicolau, Teerin Liewluck, Margherita Milone

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations


Muscle disorders are characterized by differential involvement of various muscle groups. Among these, weakness predominantly affecting finger flexors is an uncommon pattern, most frequently found in sporadic inclusion-body myositis. This finding is particularly significant when the full range of histopathological findings of inclusion-body myositis is not found on muscle biopsy. Prominent finger flexor weakness, however, is also observed in other myopathies. It occurs commonly in myotonic dystrophy types 1 and 2. In addition, individual reports and small case series have documented finger flexor weakness in sarcoid and amyloid myopathy, and in inherited myopathies caused by ACTA1, CRYAB, DMD, DYSF, FLNC, GAA, GNE, HNRNPDL, LAMA2, MYH7, and VCP mutations. Therefore, the finding of finger flexor weakness requires consideration of clinical, myopathological, genetic, electrodiagnostic, and sometimes muscle imaging findings to establish a diagnosis.

Original languageEnglish (US)
Pages (from-to)445-454
Number of pages10
JournalMuscle and Nerve
Issue number4
StatePublished - Oct 1 2020


  • distal myopathy
  • finger flexor weakness
  • inclusion-body myositis
  • myopathy with rimmed vacuoles
  • myotonic dystrophy

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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