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Use of double leg injury screening to assess single leg biomechanical risk variables

By February 17, 2021 Customer Research


Department of Exercise and Sport Science, MOTION Science Institute, University of North Carolina, Chapel Hill, NC



The purpose of this article was to determine if differences in kinematic and kinetic variables observed in a double-leg screen carried over to a single-leg task.


We used a case-control design with grouping based on performance during a double-leg jump landing.


All participants were selected from a large university setting and testing was performed in a biomechanics laboratory.


Participants were females between 18 and 25 years of age with at least high school varsity experience in one or more of the following sports: soccer, lacrosse, field hockey, rugby, basketball, or team handball.

Main outcome measures

Primary outcome measures were knee angles in the frontal and sagittal planes as well as vertical ground reaction force (vGRF).


There were significant between group differences in peak knee flexion and knee flexion displacement during both the double and single-leg tasks, however between group differences for peak knee valgus and knee valgus displacement noted in the double-leg task were not observed in the single-leg task. vGRF was significantly different in the single-leg task but not the double-leg task.


A double leg screening may not provide complete identification of risk of injury during sports requiring single leg tasks.


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