Myerson Classification (Lisfranc Injury)
Myerson classification (a modification of the Hardcastle / Quenu-Kuss classification) of a Lisfranc (tarsometatarsal, TMT) injury, types A/B1/B2/C1/C2, by the pattern and direction of the tarsometatarsal incongruity.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Myerson type
- Type B2 - partial, lateral (lateral four)
Result: Myerson type B2: partial incongruity, lateral - lateral displacement of one or more of the lateral four metatarsals; the first tarsometatarsal joint stays congruous.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Type A
- Total incongruity: all five metatarsals displaced the same direction (homolateral).
- Type B1
- Partial, medial: medial displacement of the first metatarsal.
- Type B2
- Partial, lateral: lateral displacement of one or more of the lateral four metatarsals.
- Type C1
- Divergent, partial: only some of the metatarsals diverge.
- Type C2
- Divergent, total: all five metatarsals diverge.
What you enter
- Myerson type
How this is calculated
Myerson MS, Fisher RT, Burgess AR, Kenzora JE. Fracture dislocations of the tarsometatarsal joints: end results correlated with pathology and treatment. Foot Ankle. 1986;6(5):225-242. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.