The Limb Symmetry Index (LSI) is an excellent guide to objectively determine discrepancies in your patient’s upper and/or lower limb strength, function, and mobility.
The LSI is calculated by taking the average of any test scores for the affected limb, divided by the unaffected limb, multiplied by 100 to obtain a percentage difference between limbs.
Clinically, it is an easy-to-use, quick measure that can provide valuable data for baseline and progression purposes. It has been shown to be of significant importance in deciding when an athlete is ready to return to sport after anterior cruciate ligament (ACL) injury, with percentage values for knee extension and flexion strength equal to or above 90% considered to be satisfactory (Abrams et al., 2014).
Recent studies have also shown that:
Would you like to learn more about the LSI?
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