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Extensor hallucis capsularis: frequency and identification on MRI.

Nathan Boyd1, Hugh Brock, Albert Meier

  • 1Department of Orthopedics, School of Medicine, University of New Mexico, Albuquerque, NM 87131-0001, USA. nhboyd@salud.unm.edu

Foot & Ankle International
|March 17, 2006
PubMed
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The extensor hallucis capsularis (EHC) tendon is common, found in 88% of cadavers. This tendon, suitable for reconstructive surgery, can sometimes be identified using MRI.

Area of Science:

  • Anatomy
  • Orthopedics
  • Radiology

Background:

  • The extensor hallucis capsularis (EHC) is an accessory tendon occasionally found alongside the extensor hallucis longus (EHL).
  • Its anatomical variations and potential clinical applications remain areas of interest.

Purpose of the Study:

  • To determine the prevalence of the EHC tendon.
  • To describe its origin, insertion, and physical characteristics.
  • To evaluate its suitability as a tendon graft and assess MRI's utility in its identification.

Main Methods:

  • Cadaveric dissection of 81 feet to examine the EHC.
  • Recording of EHC size and location parameters.
  • MRI evaluation of six cadaver legs to assess radiographic identification.

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Main Results:

  • The EHC was present in 88% of dissected feet.
  • Origin was typically from the EHL tendon/muscle (93%), with insertion into the first metatarsophalangeal joint capsule (99%).
  • EHC width varied; MRI accuracy for detection was dependent on tendon width.

Conclusions:

  • A significant portion of the population may possess a usable EHC tendon for grafting, especially in hallux surgeries.
  • MRI shows potential for preoperative EHC identification, aiding surgical planning.