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Related Experiment Videos

Congenital fibre type disproportion.

H J ter Laak, H H Jaspar, F J Gabreëls

    Clinical Neurology and Neurosurgery
    |January 1, 1981
    PubMed
    Summary

    Congenital fibre type disproportion in children shows smaller type 1 muscle fibres compared to type 11. Biopsies suggest spinal abnormalities may underlie these observed muscle fibre differences.

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    Area of Science:

    • Neurology
    • Muscle Physiology
    • Pediatric Diseases

    Background:

    • Congenital fibre type disproportion (CFD) is a rare neuromuscular disorder characterized by hypotonicity and muscle weakness.
    • The condition presents with distinct muscle fibre size abnormalities, primarily affecting type 1 and type 11 fibres.

    Observation:

    • This study describes four pediatric patients diagnosed with congenital fibre type disproportion.
    • Muscle biopsies revealed that type 1 muscle fibres were significantly smaller (at least 12%) than type 11 fibres in all patients.
    • Neuromuscular junction assessment showed no increase in terminal innervation ratio (TIR), but one patient exhibited a reduced number of terminal knobs.

    Findings:

    • The primary finding is the consistent observation of smaller type 1 fibres relative to type 11 fibres in children with CFD.

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  • Analysis of fibre type distribution in one case suggested a potential link between spinal abnormalities and the observed muscle pathology.
  • The absence of TIR increase alongside decreased terminal knobs may indicate specific denervation patterns.

    • Implications:

    • These findings contribute to understanding the pathophysiology of congenital fibre type disproportion.
    • The potential link to spinal issues highlights the importance of comprehensive neurological evaluation in affected children.
    • Further research into the neurogenic or myogenic origins of CFD is warranted based on these observations.