human mechanics
SuperClassA lumbar spine specimen from L1 to L3 is tested under a flexion moment with L3 fixed and L1 and L2 free to move. Three IREDs are attached to each vertebra and the 3-D location of each marker is known in two positions. Using the values given below calculate rotation about and translation along a helical axis for L1 and L2. All coordinates are given in the fixed reference frame.
Position 1 | Position 2 | |||||||
reference LEDs | reference LEDs | |||||||
x | y | z | x | y | z | |||
1 | 242.2 | 183.4 | 56 | 1 | 242.3 | 183.7 | 55.7 | |
2 | 39.3 | 186.5 | 58 | 2 | 39.3 | 186.8 | 58.1 | |
3 | 138.4 | 82 | 57.6 | 3 | 138.5 | 82.2 | 57.6 | |
L1 LEDs | L1 LEDs | |||||||
x | y | z | x | y | z | |||
1 | 261 | 212.7 | 111.5 | 1 | 260.3 | 222.4 | 127.4 | |
2 | 43.1 | 196.3 | 116.4 | 2 | 42.2 | 205.8 | 129.5 | |
3 | 130.5 | 96.7 | 104 | 3 | 129.6 | 106.6 | 136.8 | |
L2 LEDs | L2 LEDs | |||||||
x | y | z | x | y | z | |||
1 | 242.2 | 214.5 | 164.8 | 1 | 240.1 | 240.5 | 184.5 | |
2 | 31.6 | 204.1 | 144.7 | 2 | 30.1 | 224.6 | 163.1 | |
3 | 149.7 | 119.1 | 152.8 | 3 | 148 | 145.2 | 197.4
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10 years ago
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human_mechanics.xlsx
