IC21[1].2 Leg Extension

IC21[1].2 Leg Extension - Biomechanical studies are often...

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θ Problem Type: Find: Given: Biomechanical studies are often used to estimate the forces at joints and in the muscles. This can be done to help design effective exercises, and to make sure that motions after rehab (e.g., after knee surgery) do not introduce dangerous forces. The knee extension is a common exercise to strengthen the quadriceps. For this analysis we will assume there is simply a 20 kg mass placed a distance 40 cm from the knee joint center. Cadaver studies show that that the patella tendon inserts 10 cm below the knee joint center ( O ) and 2 cm from the center line of the tibia (see figure). Anthropometric studies have shown that for an 80kg, 178 cm male, the mass of the lower leg and foot is about 5 kg, the CG of this segment is 30 cm from the knee, and the radius of gyration about the knee is 35 cm. At θ = 60 degrees, calculate the forces at the knee joint and the force in the patella tendon (this is the force generated by the quadriceps).
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