Bigliani Classification (Acromion Morphology)
The Bigliani classification of acromion morphology, by the shape of the acromial undersurface on the supraspinatus-outlet view, types I/II/III.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Bigliani type
- II - curved acromion
Result: Bigliani type II: a curved acromion, the undersurface paralleling the humeral head.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Type I
- Flat acromial undersurface.
- Type II
- Curved acromial undersurface (paralleling the humeral head).
- Type III
- Hooked acromion (anterior hook); most associated with impingement and cuff tears.
What you enter
- Bigliani type
How this is calculated
Bigliani LU, Morrison DS, April EW. The morphology of the acromion and its relationship to rotator cuff tears. Orthop Trans. 1986;10:228. Search PubMed for this source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.