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Meralgia paresthetica. An anatomical interpretation.

J G Edelson, H Nathan

    Clinical Orthopaedics and Related Research
    |January 1, 1977
    PubMed
    Summary
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    Enlarged lateral femoral cutaneous nerves, or pseudoganglia, were found in 51% of adult dissections, but not in fetal ones. This suggests posture may contribute to meralgia paresthetica.

    Area of Science:

    • Anatomy
    • Histology
    • Human Posture

    Background:

    • The lateral femoral cutaneous nerve is susceptible to compression.
    • Idiopathic meralgia paresthetica causes sensory disturbances in the thigh.

    Purpose of the Study:

    • To investigate the anatomical and histological characteristics of the lateral femoral cutaneous nerve.
    • To explore potential causes of idiopathic meralgia paresthetica.

    Main Methods:

    • Dissection of 110 lateral femoral cutaneous nerves from 90 adult and 20 fetal cadavers.
    • Histological examination of nerve tissue, focusing on pseudoganglion formation.

    Main Results:

    • Pseudoganglia were observed in 51% of adult specimens where the nerve passes under the inguinal ligament.

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  • Histology revealed thickened nerve sheath layers (epineurium, perineurium, endoneurium) in pseudoganglia.
  • No pseudoganglia or abnormalities were found in fetal nerves.

    • Conclusions:

    • The development of pseudoganglia in the lateral femoral cutaneous nerve may be linked to mechanical stress from erect human posture.
    • These findings suggest a potential mechanism for the pathogenesis of idiopathic meralgia paresthetica.