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Related Experiment Videos

The first dorsal extensor compartment: an anatomic study

M H Gonzalez1, R Sohlberg, A Brown

  • 1Department of Orthopedics, University of Chicago, IL, USA.

The Journal of Hand Surgery
|July 1, 1995
PubMed
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Anatomical study of 66 cadaver hands reveals frequent variations in the first dorsal compartment. These variations, including septa and multiple slips of the abductor pollicis longus tendon, are common and impact anatomical understanding.

Area of Science:

  • Anatomy
  • Orthopedics
  • Surgical Anatomy

Background:

  • The first dorsal compartment is crucial for wrist and thumb function.
  • Anatomical variations can complicate surgical procedures and lead to conditions like De Quervain's tenosynovitis.
  • Understanding variations in the extensor pollicis brevis and abductor pollicis longus tendons is clinically significant.

Purpose of the Study:

  • To meticulously define the anatomical variations within the first dorsal compartment of the hand.
  • To investigate the prevalence and characteristics of septa and accessory tendon slips.
  • To clarify the relationship between anatomical variations and the superficial radial nerve.

Main Methods:

  • Dissection of 66 adult cadaver hands.
  • Detailed examination of the first dorsal compartment structures.

Related Experiment Videos

  • Documentation of septa, tendon compartments, and accessory tendon slips.
  • Identification of relationships with the superficial radial nerve.

    • Main Results:

    • A septum was identified in 31 hands (47%).
    • The extensor pollicis brevis tendon was enclosed in a separate compartment in 29 hands (44%).
    • Multiple slips of the abductor pollicis longus tendon were observed in 38 hands (58%), with accessory slips inserting into the trapezium and thenar muscles.
    • Partial separation or grooving of the abductor pollicis longus tendon was common but did not consistently indicate a separate tendon slip.

    Conclusions:

    • Significant anatomical variations exist within the first dorsal compartment.
    • The presence of septa and multiple abductor pollicis longus slips is common.
    • These findings enhance the understanding of first dorsal compartment anatomy and may inform surgical approaches and diagnosis of related pathologies.