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Related Experiment Videos

The peroneocalcaneus internus muscle: MR imaging features

J M Mellado1, Z S Rosenberg, J Beltran

  • 1Department of Radiology, Hospital for Joint Diseases Orthopaedic Institute, New York, NY 10003, USA.

AJR. American Journal of Roentgenology
|August 1, 1997
PubMed
Summary

The rare peroneocalcaneus internus muscle, originating from the fibula and inserting on the calcaneus, may displace the flexor hallucis longus. This anatomical variation can indirectly affect the tarsal tunnel

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Area of Science:

  • Anatomy
  • Radiology
  • Musculoskeletal System

Background:

  • The peroneocalcaneus internus muscle is a rare anatomical variant.
  • Its presence and radiological characteristics have not been previously documented.

Purpose of the Study:

  • To describe the normal anatomy of the peroneocalcaneus internus muscle.
  • To detail its magnetic resonance (MR) imaging characteristics.

Main Methods:

  • Retrospective review of MR imaging studies.
  • Identification and analysis of the peroneocalcaneus internus muscle in eight patients.

Main Results:

  • The peroneocalcaneus internus muscle originates from the distal fibula.
  • It courses through the tarsal tunnel and inserts on the calcaneus.

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  • The muscle may displace the flexor hallucis longus medially.

    • Conclusions:

    • The peroneocalcaneus internus muscle is a rare anatomical finding.
    • Its anatomical course and MR appearance are described.
    • Potential for indirect neurovascular bundle encroachment within the tarsal tunnel is noted.