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Type 4 acromion: a new classification.

W J Vanarthos1, J U Monu

  • 1Department of Radiology, University of Kentucky, Lexington, USA.

Contemporary Orthopaedics
|February 7, 1995
PubMed
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A fourth type of acromion, characterized by a convex undersurface, has been identified. This study investigates the prevalence of this new acromial morphology in the general population using MRI scans.

Area of Science:

  • Orthopedic anatomy
  • Radiology
  • Skeletal morphology

Background:

  • The acromion, a bony process of the shoulder blade, plays a crucial role in shoulder biomechanics.
  • Previous classifications describe three types of acromial morphology based on the undersurface shape: straight (Type 1) and concave (Types 2 and 3).
  • These classifications are relevant to understanding shoulder impingement syndrome.

Purpose of the Study:

  • To describe a previously unrecognized fourth type of acromial morphology.
  • To determine the frequency of this Type 4 acromion in a population initially assessed as normal via MRI.
  • To contribute to a more comprehensive understanding of acromial variations.

Main Methods:

  • Retrospective review of magnetic resonance (MR) examinations.

Related Experiment Videos

  • Analysis of 30 MR scans originally interpreted as normal.
  • Classification of acromial morphology based on the shape of the undersurface.

    • Main Results:

    • Identification and description of a Type 4 acromion, defined by a convex undersurface near the distal end.
    • Initial findings suggest the presence of Type 4 acromions in a population considered normal.
    • The frequency of Type 4 acromions in this cohort requires further statistical analysis.

    Conclusions:

    • A fourth type of acromial morphology (Type 4) with a convex undersurface is proposed.
    • This variation may be present in the normal population, necessitating its inclusion in future classifications.
    • Further research is warranted to establish the prevalence and clinical significance of Type 4 acromions.