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[Morton's disease: optic and electron microscopy observations].

L De Palma1, A Tulli

  • 1Istituto di Clinica Ortopedica, Università Cattolica del Sacro Cuore-Roma, Italy.

Acta Orthopaedica Belgica
|January 1, 1991
PubMed
Summary
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Morton metatarsalgia involves damage to the common digital nerve, characterized by swelling and amorphous substance deposition. Findings suggest nerve compression by surrounding structures causes this condition.

Area of Science:

  • Neuropathology
  • Foot Anatomy
  • Histopathology

Context:

  • Morton metatarsalgia, often termed neuroma, affects the common digital nerve in the foot.
  • Previous understanding of the condition's pathogenesis remains incomplete.

Purpose:

  • To investigate the histopathological changes in the common digital nerve in patients with Morton metatarsalgia.
  • To elucidate the role of nerve compression in the development of Morton's disease.

Summary:

  • Optic and electron microscopy revealed perineural and epineural thickening with amorphous substance deposition in nerves affected by Morton metatarsalgia.
  • Nerve fiber replacement by amorphous substance and endoneural fibrositis were observed in long-standing cases.
  • Electron microscopy indicated increased collagenous endoneural fibers and microfibrils after one year.

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Impact:

  • Histopathological findings support a compressive mechanism in the pathogenesis of common interdigital nerve damage in Morton's disease.
  • The study identifies the "neuroma" as a pre-stenotic swelling, clarifying the pathology of Morton metatarsalgia.