Mayfield Classification (Perilunate Instability)
Mayfield classification of progressive perilunar (perilunate) instability, stages I/II/III/IV, by how far the ligamentous disruption has progressed around the lunate.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Mayfield stage
- Stage III - midcarpal dislocation (lunotriquetral)
Result: Mayfield stage III: midcarpal dislocation - added disruption of the lunotriquetral ligament; the triquetrum separates from the lunate.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Stage I
- Scapholunate dissociation (scapholunate ligament).
- Stage II
- Perilunate dislocation (capitolunate joint).
- Stage III
- Midcarpal dislocation (lunotriquetral ligament).
- Stage IV
- Lunate dislocation (dorsal radiocarpal - lunate extruded volarly).
What you enter
- Mayfield stage
How this is calculated
Mayfield JK, Johnson RP, Kilcoyne RK. Carpal dislocations: pathomechanics and progressive perilunar instability. J Hand Surg Am. 1980;5(3):226-241. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.