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Related Experiment Videos

The extensor tendons to the little finger: an anatomic study

M H Gonzalez1, T Gray, E Ortinau

  • 1Department of Orthopaedics, University of Illinois at Chicago 60612-7342, USA.

The Journal of Hand Surgery
|September 1, 1995
PubMed
Summary

Anatomical variations in the little finger

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Area of Science:

  • Anatomy
  • Orthopedics
  • Hand Surgery

Background:

  • The extensor tendon anatomy of the little finger is complex.
  • Understanding variations is crucial for surgical planning and treating nerve injuries.

Purpose of the Study:

  • To meticulously delineate the anatomical variations of extensor tendons to the little finger.
  • To identify factors predisposing to little finger dysfunction after injury or surgery.

Main Methods:

  • Dissection of 50 cadaver hands.
  • Detailed examination of extensor digitorum communis, juncturae, and extensor digiti minimi.
  • Documentation of anatomical variants and their potential clinical implications.

Main Results:

  • Extensor digitorum communis was present in 35 hands; 12 of 15 hands lacking it had a junctura.
  • Three hands lacked both extensor digitorum communis and juncturae, posing a risk of extension loss if extensor digiti minimi is transferred.
  • 22 hands exhibited variants (extensor digiti minimi attachment to abductor tubercle or unbalanced ulnar slip) potentially causing Wartenberg's sign in cases of ulnar nerve compromise.

Conclusions:

  • Significant anatomical variations exist in the extensor tendons of the little finger.
  • Awareness of these variations, particularly the absence of extensor digitorum communis or juncturae, is vital when considering extensor digiti minimi tendon transfer.
  • Certain anatomical factors identified may predispose individuals to Wartenberg's sign following ulnar nerve injury.

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