Evaluation of biofidelity and repeatability of THOR-Lx metric under axial impact loading

This study evaluated biofidelity and repeatability of THOR-Lx under two axial impact loading conditions. Four cadaveric lower limbs were tested under a 3.1 m/s axial impact condition. Then, the responses were normalized to those of the 50th percentile male and the 5th percentile female using a mass...

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Bibliographic Details
Published in:International journal of precision engineering and manufacturing 2017-07, Vol.18 (7), p.1027-1034
Main Authors: Kim, Taewung, Funk, James R., Bollapragada, Varun, Ye, Xin, Crandall, Jeff
Format: Article
Language:English
Subjects:
Axial loads
Bearings
Bending moments
Corridors
Displacement
Engineering
Impact loads
Industrial and Production Engineering
Knee
Limbs
Materials Science
Product design
Regular Paper
Reproducibility
Scaling
Stiffening
Tibia
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Summary:This study evaluated biofidelity and repeatability of THOR-Lx under two axial impact loading conditions. Four cadaveric lower limbs were tested under a 3.1 m/s axial impact condition. Then, the responses were normalized to those of the 50th percentile male and the 5th percentile female using a mass scaling technique. The response corridors for foot plate displacement and three axial loads measured at foot plate, mid-sections of tibia and fibula, and knee plate were developed for the two target anthropometries. The THORLx was tested under matching conditions to evaluate its biofidelity and repeatability. Lastly, the responses of THOR-Lx with foot and MIL-spec shoe and molded shoe configurations were compared under a 5.3 m/s impact loading condition. THOR-Lx exhibited biofidelic and repeatable responses regarding Biorank scores and ISO rating scores, respectively. Under the 5.3 m/s impact conditions, the THOR-Lx with MIL-spec shoe exhibited greater ankle inversion and tibial bending moments than that of THOR-Lx with molded shoe. Lastly, THOR-Lx with both shoe configurations exhibited a stiffening behavior when the axial load exceeded around 4 kN. It was concluded that THOR-Lx is biofidelic under an axial impact loading condition until 4 kN, but it requires a modification to be biofidelic under a higher load.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-017-0121-5