A 75 kg man that is 1.9 meters tall is able to generate 85Nm of flexor torque at the hip when the lower extremity is fully extended and the hip is flexed 40 degrees from the floor
A 75 kg man that is 1.9 meters tall is able to generate 85Nm of flexor torque at
the hip when the lower extremity is fully extended and the hip is flexed 40
degrees from the floor. Knowing the patient’s strength can he safely complete
straight leg lifts with a 7 kg mass attached at the ankle joint? Provide your hip
torque value along with your answer. Use the following 3 segments to complete
your answer: 1) Thigh, 2) Leg, and 3) Foot (do not combine segments). Assume
that the foot is plantarflexed.
Link Length Fraction of Stature Male Female Endpoints Hand 0. 1080 0.0980 ulnar styloid to end of 2nd finger Forearm 0. 1510 0. 1460 elbow axis to ulnar styloid Upper arm 0.1877 0.1843 head of humerus to elbow axis Head+Neck 0. 1820 0.1820 C7 to top of head Thigh 0.2574 0.2542 greater trochanter to knee axis Leg 0.2287 0.2298 knee axis to lateral malleolus Shoulder Width 0.2040 0. 1950 distance between distal ends of clavicle Hip Width (between joint centers) 0. 1010 0.1120 distance between ASIS Foot Width 0.0550 0.0550 distance between medial/lateral malleoli Foot Length 0. 1520 0.1360 calcaneus to end of 2nd toe Foot Height 0.0390 0.0390 ground to lateral malleolus SEGMENT COM LOCATION Segment Weight as Fraction of Total BW Male Female COM (proximal) COM (distal) Hand 0.0067 0.0062 0.506 0.494 Forearm 0.0178 0.0152 0.430 0.570 Upper arm 0.0298 0.0281 0.436 0.564 Torso + head 0.3928 0.3780 0.660 0.340 Head + neck 0.0715 0.0688 1.000 0.000 Pelvis 0.1302 0. 1358 0. 105 0.895 Torso + pelvis 0.4515 0.4451 Thigh 0. 1262 0. 1318 0.433 0.567 Leg 0.0433 0.0481 0.433 0.567 Foot 0.0147 0.0138 0.500 0.500
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