Table 1: Anatomical and Physiological Parameters and the Amount that they were Varied (Control ± 5% or ± 2.9°) in the Knee Model for Drop Landing Trials

Parameter Control +5% -5%
Initial Moment Arm (cm)
Patellar tendon 4.00 4.20 3.80
Gastrocnemius (knee) 2.50 2.63 2.38
Gastrocnemius (ankle) 5.30 5.57 5.04
Hamstring 3.00 3.15 2.85
Change in Moment Arm (cm/Degrees Knee Flexion)
Hamstring 1.50 1.58 1.43
ACL stiffness (N/mm) 216 226.8 205.2
Nonlinear activation parameters 1.70 1.785 1.651
Parameter Control +2.9° -2.9°
Tibial slope (degrees) 8.5 11.4 5.6
Initial Line of Force (Degrees)
Hamstring 6.00 8.90 3.10
Patellar tendon 15.0 17.9 12.1
Change in Line of Force (Degrees/Degrees Knee Flexion)
Hamstring 1.00 1.05 0.95
Patellar tendon 0.192 0.215 0.170