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Coracoacromial ligament function: a phylomorphic analysis

F J Kummer1, K Blank, J D Zuckerman

  • 1Department of Orthopaedic Surgery, Hospital for Joint Diseases, New York, New York 10003, USA.

Bulletin (Hospital for Joint Diseases (New York, N.Y.))
|January 1, 1996
PubMed
Summary
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The coracoacromial ligament (CAL) in humans isn't vestigial. Evolutionary analysis reveals it enhances hominoid shoulder stability, representing a key developmental stage.

Area of Science:

  • Anthropology
  • Evolutionary Biology
  • Anatomy

Background:

  • The coracoacromial ligament (CAL) is part of the shoulder complex.
  • Its evolutionary significance and function in hominoids are not fully understood.
  • Previous assumptions suggested it might be a vestigial structure in humans.

Purpose of the Study:

  • To investigate the evolutionary development of the coracoacromial ligament (CAL) in hominoids.
  • To examine the relationship between CAL morphology and shoulder function.
  • To determine the functional significance of the CAL in the human shoulder.

Main Methods:

  • Quantification of various morphologic parameters in the coracoacromial region.
  • Analysis of osseous dimensions and CAL length across five hominoid genera.

Related Experiment Videos

  • Evolutionary analysis within the order Anthropoidea.

    • Main Results:

    • No evolutionary correlation was found for several parameters within the family Hominoidea.
    • CAL length and osseous dimensions did not show evolutionary correlation within Hominoidea.
    • Evolutionary analysis within the order Anthropoidea suggests a functional role for the CAL.

    Conclusions:

    • The coracoacromial ligament (CAL) is not solely a vestigial structure in humans.
    • The CAL represents a developmental stage in the hominoid shoulder.
    • It functions to increase mechanical stability of the superior bony vault.