1. Reduced hip extension during walking: Healthy elderly and fallers versus young adults 
D.Casey Kerrigan, MD, MS, Laura W. Lee, MD, James J. Collins, PhD, Patrick O. Riley, PhD, Lewis A. Lipsitz, MD 
Archives of Physical Medicine and Rehabilitation 
Volume 82, Issue 1, Pages (January 2001)
DOI: /apmr
Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

2. Fig. 1
Pelvic kinematics markers: left and right posterior iliac spines (PSIS) and sacrum, hip marker (Hip), lateral condyle (LC) marker, extended (Ext) knee marker, medial condyle (MC), knee joint center (Knee). Anterior pelvic tilt: rotation of the pelvic segment about the laboratory Z axis (Zlab). Hip flexion and extension: rotation of the thigh segment with respect to the pelvic Z axis (Zp).
Archives of Physical Medicine and Rehabilitation  , 26-30DOI: ( /apmr )
Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

3. Fig. 2
Hip, knee, and ankle sagittal plane motion during comfortable walking speed, plotted over 100% of gait cycle for elderly fallers, elderly nonfallers, and young adults.
Archives of Physical Medicine and Rehabilitation  , 26-30DOI: ( /apmr )
Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

4. Fig. 3
Sagittal pelvic plane motion of anterior and posterior tilt for (A) elderly fallers and (B) elderly nonfallers during comfortable and fast speeds of walking versus young adults walking at comfortable speed plotted over 50% of gait cycle.
Archives of Physical Medicine and Rehabilitation  , 26-30DOI: ( /apmr )
Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions