Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 10, 2013
   Pages 1449 — 1456

Abstract — Modeling effects of sagittal-plane hip joint stiffness on reciprocating gait orthosis-assisted gait

William Brett Johnson, PhD;1–2* Stefania Fatone, PhD, BPO(Hons);1 Steven A. Gard, PhD1–3

1Department of Physical Medicine and Rehabilitation, Northwestern University Prosthetics-Orthotics Center, Feinberg School of Medicine, Chicago, IL; 2Department of Biomedical Engineering, McCormick School of Engineering and Applied Science, Northwestern University, Evanston, IL; 3Jesse Brown Department of Veterans Affairs Medical Center, Chicago, IL

Abstract — Upright ambulation is believed to improve quality of life for persons with lower-limb paralysis (LLP). However, ambulatory orthoses for persons with LLP, like reciprocating gait orthoses (RGOs), result in a slow, exhausting gait. Increasing the hip joint stiffness of these devices may improve the efficiency of RGO-assisted gait. The small, diverse population of RGO users makes subject recruitment challenging for clinical investigations. Therefore, we developed a lower-limb paralysis simulator (LLPS) that enabled nondisabled persons to exhibit characteristics of RGO-assisted gait, thereby serving as surrogate models for research. For this study, tests were conducted to determine the effects of increased hip joint stiffness on gait of nondisabled persons walking with the LLPS. A motion capture system, force plates, and spirometer were used to measure the hip flexion, crutch ground reaction forces (GRFs), and oxygen consumption of subjects as they walked with four different hip joint stiffness settings. Increasing the hip joint stiffness decreased hip flexion during ambulation but did not appear to affect the crutch GRFs. Walking speed was observed to initially increase with increases in hip joint stiffness, and then decrease. These findings suggest that increasing hip joint stiffness may increase walking speed for RGO users.

Key words: ambulation, biomechanics, gait, hip joint stiffness, hip-knee-ankle-foot orthosis, lower-limb paralysis, modeling, orthotic devices, reciprocating gait orthosis, RGO.

View HTML  ¦  View PDF  ¦  Contents Vol. 50, No.10
This article and any supplementary material should be cited as follows:
Johnson WB, Fatone S, Gard SA. Modeling effects of sagittal-plane hip joint stiffness on reciprocating gait orthosis-assisted gait. J Rehabil Res Dev. 2013;50(10): 1449–56.
ResearcherID/ORCID: Stefania Fatone, PhD, BPO(Hons): E-8490-2011; Steven A. Gard, PhD: D-9935-2011; William Brett Johnson, PhD: K-5231-2012

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