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. Author manuscript; available in PMC: 2014 Sep 10.
Published in final edited form as: J Strength Cond Res. 2012 Aug;26(8):2272–2292. doi: 10.1519/JSC.0b013e31825c2c7d

Figure 4.

Figure 4

Example of representative subject with excessive knee valgus during the drop vertical jump that contributes to her increased risk to demonstrate high KAM landing mechanics. A and B) The calibrated displacement measure between the 2 marked knee coordinates is representative of knee valgus motion during the drop vertical jump. C and D). The displacement of knee flexion is calculated as the differences in knee flexion angles at the frame before initial contact and maximum knee flexion and is representative of knee flexion ROM. E) Completed algorithm for the representative subject (tibia length: 41.0 cm; knee valgus motion: 9.0 cm; knee flexion ROM: 59.8°; mass: 67.5 kg; QuadHam ratio: 1.90). Based on her demonstrated measurements, this subject would have a 98% (137.5 points) chance to demonstrate high KAM during the drop vertical jump. Her actual KAM measure for the presented drop vertical jump that was quantified simultaneously with three-dimensional motion analysis was 44.1 N m of knee abduction load.