Multiplanar analysis of acromion morphology.

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  • Additional Information
    • Source:
      Publisher: Sage Publications Country of Publication: United States NLM ID: 7609541 Publication Model: Print Cited Medium: Print ISSN: 0363-5465 (Print) Linking ISSN: 03635465 NLM ISO Abbreviation: Am J Sports Med Subsets: MEDLINE
    • Publication Information:
      Publication: 2004- : Thousand Oaks, CA : Sage Publications
      Original Publication: Baltimore, Williams & Wilkins.
    • Subject Terms:
      Acromion/*anatomy & histology ; Magnetic Resonance Imaging/*methods ; Shoulder Impingement Syndrome/*diagnostic imaging ; Shoulder Joint/*anatomy & histology; Acromion/diagnostic imaging ; Adolescent ; Adult ; Age Factors ; Aged ; Aged, 80 and over ; Female ; Humans ; Male ; Middle Aged ; Radiography ; Shoulder Joint/diagnostic imaging
    • Abstract:
      To more completely describe acromion morphology and its relationship to impingement syndrome, we performed three-dimensional magnetic resonance imaging (N = 111) or computed tomography (N = 27) on 132 symptomatic shoulders. The mean patient age was 46.2 years (range, 14 to 86). Four parameters were evaluated: the angle of anterior slope of the acromion in the midsagittal and lateral-sagittal planes, lateral acromial angulation in the coronal plane, and the presence or absence of medial encroachment in the acromioclavicular joint. Twenty-five asymptomatic age-matched shoulders were used as controls. All imaging data were combined because no significant differences existed between the two imaging techniques. The mean acromion angle was 19.4 degrees in the midsagittal plane and 20 degrees in the lateral-sagittal plane. In the coronal plane, 97 (73%) acromions were neutral and 35 (27%) were downward sloping. Medial encroachment was present in 31 (24%) shoulders. Age distribution from the 2nd to 8th decade demonstrated a consistent and gradual transition from a flat acromion in the younger decades to a more hooked acromion in the older decades that was significant in both the midsagittal and lateral-sagittal planes. Furthermore, a greater percentage of patients were found to have downward angulating acromions with increasing age. Ninety-eight patients (74%) had stage II or III impingement. Of these shoulders, 39 (40%) had type I acromions, 51 (52%) type II, and 8 (8%) type III. Twenty-eight of 33 acromions with coronal lateral downward sloping had impingement, and all 31 shoulders with medial encroachment had impingement.
    • Publication Date:
      Date Created: 19981216 Date Completed: 19990224 Latest Revision: 20170214
    • Publication Date:
      20240829
    • Accession Number:
      10.1177/03635465980260061701
    • Accession Number:
      9850788