A person is performing walking gait trials across a laboratory.At heel strike the hip flexion angular velocity is 0.70 rad/s, kneeflexion angular velocity is 4.15 rad/s, and ankle plantar flexionangular velocity is -0.70 rad/s. Additionally, moment of inertia ofthe hip is 0.70 kgm2, moment of inertia of the knee is0.90 kgm2, and moment of inertia of the ankle is 1.00kgm2. What is the sagittal plane angular momentum of thehip, knee, and ankle joints at heel strike?
- Hhip at heel strike: ____________________
- Hknee at heel strike: ___________________
- Hankle at heel strike: __________________
Once this person transitions through the stance phase to toe off(e.g. propulsion) the hip flexion angular velocity increases to3.15 rad/s, knee flexion angular velocity is 4.95 rad/s, and ankleplantar flexion angular velocity is –8.10 rad/s. If we assume gaitvelocity is constant during the stance phase, what is the moment ofinertia of the hip (mass of femur = 8.50 kg), knee (mass of shank =2.60 kg), and ankle (mass of foot = 0.82 kg) at toe off?Furthermore, what is the radius of gyration of the hip, knee, andankle at toe off?
- Ihip at toe off: ____________________
- Iknee at toe off: ___________________
- Iankle at toe off: __________________
- Khip at toe off: ____________________
- Kknee at toe off: ___________________
- Kankle at toe off: __________________
