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QUESTION 2 [TOTAL MARKS: 25 Q2(a) Name the key components of a transtibial prosthetic device. [4 Marks) Q2(b) Given the data tabulated below (Table 2.1): (0) Sketch the position of the leg (foot, lower leg, upper leg) at Frame 50 [1 Mark] (ii) Calculate the angle of the upper leg in space at Frame 50. [2 marks] (ii) Calculate the angle between the upper and lower leg at Frame 50 [2 marks] Table 2.1 Filtered Marker Kinematics Marker Hip Knee Ankle Heel Ball GRF Frame Time x (m) y (m) x (m) x (m) y (m) y (m) x(m) y (m) x (m) y (m) Vert 48 0.672 1.3931 0.8300 1.3859 0.5141 1.3034 0.1000 1.2433 0.0489 1.3997 0.0436 -16.8 375.0 49 0.686 1.4083 0.8279 1.3937 0.5123 1.3046 0.1005 1.2445 0.0494 1.3998 0.0344 -14.5 386.1 50 0.701 1.4239 0.8255 1.4018 0.5105 1.3059 0.1009 1.2460 0.0498 1.4001 0.0343 -9.6 400.3 51 0.715 1.4400 0.8230 1.4102 0.5089 1.3074 0.1014 1.2477 0.0504 1.4006 0.0342 -3.8 418.8 52 0.729 1.4564 0.8204 1.4188 0.50771.3090 0.1020 1.2494 0.05161.4014 0.0340 2.2 441.0 A-P
Q 2(c) From the data tabulated above (Table 2.1), calculate: (1) linear velocity of the knee at Frame 50. (ii) linear acceleration of the knee at Frame 50. [3 Marks] [3 Marks] Q2(d) [10 Marks] With reference to the data given in Tables 2.1 and 2.2, calculate the joint reaction forces and moment about the ankle joint at frame 50, if the centre of pressure acts at the ball of the foot a, az Table 2.2 Anthropometric and Kinematic Data (Frame 50) Segment Mass Centre of Mass Radius of ay (Proximal) Gyration (C. of M) (c. of M) (C. of M) (about C. of M) (kg) (m) (m) (m/s) (m/s) (1/s) Foot 1.16 Mid-point between Heel and Ball 0.475 6.40 2.88 -49.61 [End of Question 2]