What is LSI used for?

LSI is primarily used after knee injuries (especially ACL reconstruction) to determine readiness to return to sport. An LSI of ≥90% on multiple tests is typically required.

What LSI threshold indicates return to sport readiness?

Most return-to-sport protocols require ≥90% LSI on isokinetic strength testing, single-leg jump tests, and functional movement assessments before sport clearance.

What is a normal limb symmetry index?

In uninjured athletes, LSI is typically 95-105%, reflecting small natural asymmetries. Values below 90% indicate meaningful deficits requiring targeted rehabilitation.

Limb Symmetry Index Calculator

Calculate the limb symmetry index (LSI) comparing strength, power, or function between the injured and non-injured limb, widely used in return-to-sport testing.

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Distance covered in 12 minutes (meters)

🏅 Sports Note: These calculators provide estimates based on population data and validated formulas. Individual results vary by physiology, training level, and testing conditions. Consult a qualified coach or sports scientist for personalized guidance.

How to Use

Enter the values for the scenario you are assessing. Calculate the limb symmetry index (LSI) comparing strength, power, or function between the injured and non-injured limb, widely used in return-to-sport testing. Use the lsi calculator result to inform your calculation.

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Frequently Asked Questions

What is LSI used for?

What LSI threshold indicates return to sport readiness?

What is a normal limb symmetry index?