Skeletal Radiology

, Volume 37, Issue 6, pp 535–539 | Cite as

The radiographic acromiohumeral interval is affected by arm and radiographic beam position

  • Edward V. FehringerEmail author
  • Charles E. Rosipal
  • David A. Rhodes
  • Anthony J. Lauder
  • Susan E. Puumala
  • Connie A. Feschuk
  • Matthew A. Mormino
  • David E. Hartigan
Scientific Article



The objective was to determine whether arm and radiographic beam positional changes affect the acromiohumeral interval (AHI) in radiographs of healthy shoulders.

Materials and methods

Controlling for participant’s height and position as well as radiographic beam height and angle, from 30 right shoulders of right-handed males without shoulder problems four antero-posterior (AP) radiographic views each were obtained in defined positions. Three independent, blinded physicians measured the AHI to the nearest millimeter in 120 randomized radiographs. Mean differences between measurements were calculated, along with a 95% confidence interval.


Controlling for observer effect, there was a significant difference between AHI measurements on different views (p < 0.01). All pair-wise differences were statistically significant after adjusting for multiple comparisons (all p values < 0.01).


Even in healthy shoulders, small changes in arm position and radiographic beam orientation affect the AHI in radiographs.


Shoulder Rotator cuff Acromiohumeral interval Radiographs 


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Copyright information

© ISS 2008

Authors and Affiliations

  • Edward V. Fehringer
    • 1
    Email author
  • Charles E. Rosipal
    • 1
  • David A. Rhodes
    • 1
  • Anthony J. Lauder
    • 1
  • Susan E. Puumala
    • 2
  • Connie A. Feschuk
    • 1
  • Matthew A. Mormino
    • 1
  • David E. Hartigan
    • 1
  1. 1.Department of Orthopaedic Surgery and RehabilitationUniversity of Nebraska Medical CenterOmahaUSA
  2. 2.Department of Preventive and Societal MedicineNebraska Medical CenterOmahaUSA

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