Roll-over shapes of the able-bodied knee-ankle-foot system during gait initiation, steady-state walking, and gait termination

Steve C. Miff, Andrew Hansen, Dudley S. Childress, Steven A. Gard, Margrit R. Meier

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A few investigators have described the movement of the center of pressure (COP) of the ground reaction force and the activation patterns of the lower limb muscles during gait initiation and termination. This study examines the effective rocker (roll-over shape) behavior of the knee-ankle-foot (KAF) system during gait initiation, steady-state walking (i.e. constant speed gait), and gait termination. The KAF roll-over shapes were characterized by transforming COP data of 10 able-bodied subjects from a laboratory-based coordinate system into a leg-based coordinate system. The resulting roll-over shapes (effective rockers) were characterized using a circular arc model. The KAF roll-over shapes exhibit an overall "flexed" orientation during the first step of gait initiation and an "extended" orientation during the last step of gait termination. Understanding the behavior of the anatomical KAF system during gait initiation and termination may aid in the design of prosthetic components, i.e. mechanical devices that replace complete anatomical structures. Prostheses that intend to mimic the overall behavior of physiological KAF systems (biomimetic designs) could be manufactured using approaches that are much simpler than attempting to reconstruct the complexity of the lower limb.

Original languageEnglish (US)
Pages (from-to)316-322
Number of pages7
JournalGait and Posture
Volume27
Issue number2
DOIs
StatePublished - Feb 1 2008

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Gait
Ankle
Walking
Foot
Knee
Lower Extremity
Pressure
Biomimetics
Prostheses and Implants
Leg
Research Personnel
Equipment and Supplies
Muscles

Keywords

  • Center of pressure
  • Prosthetics
  • Rocker
  • Roll-over shape

Cite this

Roll-over shapes of the able-bodied knee-ankle-foot system during gait initiation, steady-state walking, and gait termination. / Miff, Steve C.; Hansen, Andrew; Childress, Dudley S.; Gard, Steven A.; Meier, Margrit R.

In: Gait and Posture, Vol. 27, No. 2, 01.02.2008, p. 316-322.

Research output: Contribution to journalArticle

Miff, Steve C. ; Hansen, Andrew ; Childress, Dudley S. ; Gard, Steven A. ; Meier, Margrit R. / Roll-over shapes of the able-bodied knee-ankle-foot system during gait initiation, steady-state walking, and gait termination. In: Gait and Posture. 2008 ; Vol. 27, No. 2. pp. 316-322.
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