Thomazeau Occupation Ratio
Thomazeau occupation ratio of the supraspinatus, grade I to III, from the muscle and fossa areas.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Supraspinatus muscle area
- 3.1 cm^2
- Supraspinatus fossa area
- 6.2 cm^2
Result: Occupation ratio 0.5 (50%): Thomazeau grade II, moderate atrophy of the supraspinatus.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Supraspinatus muscle area
- Supraspinatus fossa area
How this is calculated
Citation
Thomazeau H, Rolland Y, Lucas C, Duval JM, Langlais F. Atrophy of the supraspinatus belly: assessment by MRI in 55 patients with rotator cuff pathology. Acta Orthop Scand. 1996;67(3):264-268. Read the sources: Thomazeau 1996 ↗, Cureus 2025 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.