1. Postural Instability and Gait Impairment During Obstacle Crossing in Parkinson's Disease 
Elizabeth L. Stegemöller, PhD, Thomas A. Buckley, EdD, Chris Pitsikoulis, EdD, Ernest Barthelemy, MEd, Ryan Roemmich, BS, Chris J. Hass, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 93, Issue 4, Pages (April 2012)
DOI: /j.apmr
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1
(A) Example of gait parameters calculated for the approach, crossing, and recovery steps during obstacle crossing. (B) Example of horizontal and vertical obstacle clearance parameters. Abbreviations: LF, leading foot; TF, trailing foot.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

3. Fig 2
Mean and SEM for gait parameters collected during obstacle crossing. *Significant differences between PD and HOA groups.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

4. Fig 3
Mean and SEM for obstacle clearance parameters. *Significant differences between PD and HOA groups. Abbreviations: LF, leading foot; TF, trailing foot.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions

5. Fig 4
Mean and SEM for (A) COM displacement, (B) COM-COP separation, and (C) MOS. *Significant differences between PD and HOA groups; P<.05. **P<.01. Abbreviations: LF, leading foot; TF, trailing foot.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2012 American Congress of Rehabilitation Medicine Terms and Conditions