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A new perspective on the walking margin of stability
Kevin Terry1, Christopher Stanley, Diane Damiano
1Department of Rehabilitation Science, George Mason University, Fairfax, VA.
Journal of Applied Biomechanics
|September 4, 2014
Summary
A new modified margin of stability (MOS) metric offers improved fall susceptibility identification during walking compared to the standard MOS(max). This enhanced gait stability assessment aids in developing better fall prevention and rehabilitation strategies.
Area of Science:
- Biomechanics
- Gait Analysis
- Human Movement Science
Background:
- Fall susceptibility identification requires reliable gait stability metrics for effective rehabilitation.
- Existing maximum margin of stability (MOS(max)) has limitations due to assumptions of fixed center of pressure (COP) and constant ground reaction force (GRF).
Purpose of the Study:
- To present a modified margin of stability (MOS) equation addressing limitations of MOS(max) for improved gait stability assessment.
- To compare the modified MOS with MOS(max) during normal walking gait.
Main Methods:
- Developed a modified MOS equation allowing for a variable COP and independent of constant GRF.
- Compared modified MOS and MOS(max) during normal walking gait in participants.
Main Results:
- The modified MOS was significantly lower than MOS(max) during a substantial part of single limb support in normal walking.
- MOS(max) may lack sensitivity to instability, potentially showing positive values when instability is present or imminent.
Conclusions:
- The modified MOS metric shows potential for enhanced gait stability assessment relevant to fall prevention and rehabilitation.
- Further research on perturbed and pathological gaits is necessary to confirm the capability of the modified MOS.
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