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Measuring lateral trunk motion in single leg squat and the single leg drop vertical jump

19th May 2014

More good news and supporting evidence concerning the usefulness, efficacy and clinical relevance of unipodal functional screening tests identifying movement impairments and injury risk of the lower limb, as used in The Performance Matrix.

Bart Dingenen concluded that Lateral Trunk Motion (LTM) can be measured with excellent intra- and intertester reliability in two-dimensional (2D) video analysis of unipodal functional screening tests.

Only the sum of Knee Valgus and Lateral Trunk Motion (measured by video analysis) was significantly correlated with the peak external knee aBduction moment (measured with three-dimensional motion analysis, while either angle alone was not. 

Prospective studies have shown that increased knee abduction angles and moments are associated with an increased risk to sustain ACL (re)injuries and Patello-femoral pain syndromes. But also trunk control may have a large effect on knee injury risk. Movements of the trunk in the direction of the stance limb during unipodal tests may increase the external knee abduction moment.

Dingenen B et. al. 2013, The reliability and validity of the measurement of lateral trunk motion in two-dimensional video analysis during unipodal functional screening tests in elite female athletes, Physical Therapy in Sport  15(2) 117-123

In this study knee valgus and lateral trunk motion angles were measured with a standard digital camera during the single leg squat and the single leg drop vertical jump. Three-dimensional motion analysis was used to measure peak external knee abduction moment. Excellent intraclass correlation coefficients for the lateral trunk motion angle were found within and between testers. The sum of knee valgus and lateral trunk motion was significantly correlated with the peak knee aBduction moment, while either angle alone was not.

 

Posted by Koen Schoolmeesters www.movetoheal.be

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