Lachman Test Grade (ACL Laxity)
Lachman test grade of anterior cruciate ligament (ACL) laxity (grades I-III), from the anterior tibial translation (vs the uninjured knee) and the endpoint quality — the standard bedside ACL-laxity maneuver.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Lachman grade
- Grade II - 6-10 mm, soft endpoint (moderate)
Result: Lachman grade II: 6 to 10 mm anterior tibial translation with a soft endpoint; moderate laxity.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Grade I
- 0-5 mm anterior tibial translation with a firm endpoint; mild laxity.
- Grade II
- 6-10 mm translation with a soft endpoint; moderate laxity. 5 mm or more suggests a complete ACL tear.
- Grade III
- 11-15 mm translation with no discernible endpoint; severe laxity.
What you enter
- Lachman grade
How this is calculated
Lachman test grading (anterior tibial translation vs the contralateral knee + endpoint quality), per StatPearls (Lachman Test, NCBI Bookshelf) and the IKDC knee-examination convention. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.