Table 1:

Justification, Optimum Value, and the Effect on the Stimulus for the Included Biomechanical Variables.

Variable	Stimulus Effect	Justification	Optimum Value	References
Lateral Trunk Flexion	Figure 1B	Lateral trunk displacement predicted ACL injuries with high sensitivity and specificity in females and flexion was also present during the time of ACL injury.	0°	58–60
Knee-to-hip joint extensor moment of force ratio	Figure 1C	Quadriceps-dominant recruitment during dynamic movement is a risk factor for lower extremity injuries.	≤1	53, 61
Knee abduction moment of force	Figure 1D	Valgus knee collapse and subsequent increased knee abduction moment occurs more frequently in ACL injury risk prone athletes.	≤0 Nm	62, 63
Vertical ground reaction force ratio	Figure 1E	Asymmetry in ground reaction force indicates preference for and the potential for abnormal joint loading on one limb.	1	62
Foot center of pressure location	Figure 1F	COP should be located towards the back of the foot (heel) as shear forces are increased as the knee moves past the toes (during the downward phase of the squat). Video evidence also shows, at the time of injury, foot positions extending past the body’s COM	COP within the back 70% of foot length	58, 63