Using the pictures below, answer the following questions. Be sure to include the
ID: 3510840 • Letter: U
Question
Using the pictures below, answer the following questions. Be sure to include the images with your markup in Image-J. Upload a SINGLE file including your answers to the questions, your graphs, and your pictures with markup. LATAI A = Starting Position on step; B = First step down landing; C=Second step down landing A. Calculate knee flexion for A, B, and C. Be sure to include images with markup in Image-J. 3 points B. Using your knowledge of biomechanical stiffness, explain which step (B or C) is less stiff. Assuming both B and C have the same vertical ground reaction force, graph an estimated stiffness curve (i.e. stress-strain curve) for the two different step down techniques (A -> B and A -> C). Both curves should be on the same graph and make sure your axes are labeled appropriately. You may approximate this graph by drawing it by hand or using a computer program. 3 points C. The average knee flexion angle (with confidence intervals) from the motion capture system is graphed below. Assuming that full foot contact occurs ~40%, are the knee sagittal kinematics different from what you measured in Question A? Why or why not? 3 pointsExplanation / Answer
Answer(a) Knee flexion is measured by using vector mechanics. The normal knee flexion angle varies from 0°to 140° .In normal Gait knee flexion angle are as follows-- normal gait 60°surfaces, stair climbing 80°, sitting rising from chair 90°, and sitting rising from toilet 115°. In the given picture , in image A knee flexion is around 0°, in image B, it is around 90° and in image C it is around 115°.
Answer (b). Stiffness in muscle is less in image C, because of less gravitational pull from the ground. It is going down phase of the walking and gravitational pull is less than that in image B.
Answer (c). Knee saggital kinetics studies are aimed to analyze over ground walking on level and sloped surfaces with a special focus on transverse and frontal plane knee kinetics. A three dimensional kinetics are studies in knee saggital kinetics. It is used in pathomechanics of osteoarthritis of knee.
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