Watson-Ballet SLAC Wrist Stage
Stages scapholunate advanced collapse (SLAC) wrist arthritis from 1 to 4 by which joints show arthritis on the radiograph.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Radioscaphoid joint
- Whole radioscaphoid joint
- Capitolunate joint
- Yes
- Radiolunate joint
- No
Result: SLAC stage 3: arthritis of the radioscaphoid and capitolunate joints, with the radiolunate joint spared.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Radioscaphoid joint
- Capitolunate joint
- Radiolunate joint
How this is calculated
Citation
Watson HK, Ballet FL. The SLAC wrist: scapholunate advanced collapse pattern of degenerative arthritis. J Hand Surg Am. 1984;9(3):358-365. Stages as described in McLean A, Taylor F. Clin Orthop Relat Res. 2019;477(3):663-666. Read the sources: Watson 1984 ↗, McLean 2019 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.