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Control of Body's Center of Mass Motion During Level Walking and Obstacle-Crossing in Older Patients with Knee Osteoarthritis

Published online by Cambridge University Press:  05 May 2011

W.-C. Hsu ,
T.-M. Wang ,
M.-W. Liu ,
C.-F. Chang ,
H.-L. Chen  and
T.-W. Lu
W.-C. Hsu*
Affiliation:
Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
T.-M. Wang*
Affiliation:
Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C. Department of Orthopaedic Surgery, National Taiwan University Hospital, Taipei, Taiwan 10051, R.O.C.
M.-W. Liu*
Affiliation:
Department of Surgery, Taiwan Adventist Hospital, Taipei, Taiwan 10556, R.O.C.
C.-F. Chang*
Affiliation:
Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
H.-L. Chen*
Affiliation:
School of Occupational Therapy, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
T.-W. Lu*
Affiliation:
Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
*
* Ph.D.
** Ph.D., M.D.
** Ph.D., M.D.
*** Ph.D. candidate
* Ph.D.
**** Professor, corresponding author
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Abstract

Knee osteoarthritis (OA) has been reported to affect the performance of ambulation, including unobstructed and obstructed gait. An increased risk of falling in patients with knee OA during obstaclecrossing, as opposed to unobstructed level walking, may be explained by the difference in the control of the body's center of mass (COM) with respect to the center of pressure (COP) while trying to ensure sufficient foot clearance. The purpose of the study was to investigate the dynamic stability in patients with knee OA during level walking and obstacle-crossing. The COM-COP inclination angles and angular velocities, as well as temporal-spatial variables, from eleven patients with bilateral knee OA and eleven normal controls were obtained during level walking and obstacle-crossing using a three-dimensional motion analysis system and forceplates. Demands in the control of the COM relative to the COP were found to be greater during obstacle-crossing in both subject groups. While less stable COM control was found around the end stage of double stance phase during obstacle-crossing when compared to level walking, patients with knee OA successfully acquired strategies in the sagittal plane to maintain close-tonormal stable COM control with normal toe clearances during both level walking and obstacle-crossing. They achieved stable transitions from single limb stance (SLS) to double limb stance (DLS) through a reduced anterior inclination angle and from DLS to SLS through increased anterior angular velocity. It is suggested that assessment of the ability to control dynamic stability in patients with knee OA should consider both the positions and velocities of the COM and COP.

Keywords

Knee osteoarthritisGaitObstacle-crossingCenter of massCenter of pressureInclination angle
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 2 , June 2010 , pp. 229 - 237
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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