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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Knee. 2014 Jul 24;21(6):1077–1083. doi: 10.1016/j.knee.2014.07.016

Figure 2.

Figure 2

Free body diagram of the lower limb with the equation (Newton’s equation of motion) used to calculate the knee adduction moment. TKJC = torque about the knee joint center (vector), I = inertia of lower limb (matrix), α = angular acceleration of lower limb (vector), ω = angular velocity of lower limb (vector), rCM/KJC = position vector from center of mass of the lower segment to the knee joint center, m = mass of lower limb (scalar), aCM = acceleration of lower limb (vector), GRF = magnitude of ground reaction force in frontal plane (scalar), lGRF = moment arm of frontal plane GRF (scalar), Fg = weight of lower limb (scalar), lg = moment arm of weight in frontal plane (scalar), KAM = knee adduction moment (scalar).