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- W2058883996 abstract "Biomechanical data characterizing the quasi-stiffness of lower-limb joints during human locomotion is limited. Understanding joint stiffness is critical for evaluating gait function and designing devices such as prostheses and orthoses intended to emulate biological properties of human legs. The knee joint moment-angle relationship is approximately linear in the flexion and extension stages of stance, exhibiting nearly constant stiffnesses, known as the quasi-stiffnesses of each stage. Using a generalized inverse dynamics analysis approach, we identify the key independent variables needed to predict knee quasi-stiffness during walking, including gait speed, knee excursion, and subject height and weight. Then, based on the identified key variables, we used experimental walking data for 136 conditions (speeds of 0.75-2.63 m/s) across 14 subjects to obtain best fit linear regressions for a set of general models, which were further simplified for the optimal gait speed. We found R(2) > 86% for the most general models of knee quasi-stiffnesses for the flexion and extension stages of stance. With only subject height and weight, we could predict knee quasi-stiffness for preferred walking speed with average error of 9% with only one outlier. These results provide a useful framework and foundation for selecting subject-specific stiffness for prosthetic and exoskeletal devices designed to emulate biological knee function during walking." @default.
- W2058883996 created "2016-06-24" @default.
- W2058883996 creator A5004284487 @default.
- W2058883996 creator A5068289770 @default.
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- W2058883996 date "2013-12-09" @default.
- W2058883996 modified "2023-10-01" @default.
- W2058883996 title "Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking" @default.
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- W2058883996 doi "https://doi.org/10.1371/journal.pone.0081841" @default.
- W2058883996 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3857237" @default.
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