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Variant course of extensor pollicis brevis tendon in the third extensor compartment.

Shiro Sugiura1,2, Yusuke Matsuura3, Takane Suzuki4

  • 1Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan.

Surgical and Radiologic Anatomy : SRA
|November 16, 2017
PubMed
Summary

An unusual anatomical variation was found where the extensor pollicis brevis (EPB) tendon ran through the third extensor compartment. This rare EPB tendon course provides insights for surgical planning and diagnosis.

Keywords:
Extensor pollicis brevisExtensor pollicis longusFirst extensor compartmentThird extensor compartmentVariation courseWrist

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Area of Science:

  • Anatomy
  • Human Anatomy
  • Musculoskeletal System

Background:

  • The extensor pollicis brevis (EPB) tendon typically courses through the first dorsal wrist compartment.
  • Anatomical variations in the EPB tendon are infrequently reported, making unusual courses exceptionally rare.

Purpose of the Study:

  • To document and describe an extremely rare anatomical variation of the extensor pollicis brevis (EPB) tendon.
  • To highlight the clinical significance of recognizing such variations in anatomical dissections.

Main Methods:

  • Routine cadaveric dissection was performed on a 96-year-old female cadaver.
  • Detailed examination and documentation of the forearm and wrist extensor tendons were conducted.

Main Results:

  • A variant extensor pollicis brevis (EPB) muscle was identified originating from the radius and interosseous membrane.
  • The EPB tendon unusually coursed through the third extensor compartment, running parallel to the extensor pollicis longus (EPL) tendon.
  • The EPB tendon inserted at the base of the proximal phalanx of the thumb, while the EPL tendon insertion was normal.

Conclusions:

  • This case presents a rare anatomical variation of the EPB tendon in the third extensor compartment alongside the EPL tendon.
  • Awareness of this variant anatomy is crucial for accurate clinical diagnosis and effective surgical planning in wrist and hand procedures.