MASES Enthesitis Score
MASES enthesitis score (Heuft-Dorenbosch 2003): 13 entheseal sites each tender (1) or non-tender (0); total 0-13 and >= 1 indicates enthesitis.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- 1st costochondral (R)
- Yes
- 1st costochondral (L)
- Yes
- Posterior superior iliac spine
- Yes
Result: MASES enthesitis 3 of 13 — enthesitis present (>= 1).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0
- No tender entheses.
- >= 1
- Enthesitis present (13 entheseal sites, each tender = 1). An enthesitis count, not a diagnosis.
What you enter
- 1st costochondral (R)
- 1st costochondral (L)
- 7th costochondral (R)
- 7th costochondral (L)
- Posterior superior iliac spine (R)
- Posterior superior iliac spine (L)
- Anterior superior iliac spine (R)
- Anterior superior iliac spine (L)
The other 5 fields
- Iliac crest (R)
- Iliac crest (L)
- Proximal Achilles (R)
- Proximal Achilles (L)
- L5 spinous process
How this is calculated
Heuft-Dorenbosch L, Spoorenberg A, van Tubergen A, et al. Assessment of enthesitis in ankylosing spondylitis (MASES). Ann Rheum Dis. 2003;62(2):127-132. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.