Article

Dynamic fluoroscopic imaging and three-dimensional model-image registration
techniques provide detailed joint kinematic measurements for motions constrained
to small volumes of space. Several groups are working to mount radiographic
imaging hardware onto mobile platforms to provide these same imaging capabilities
for observation of unrestricted activities. These dynamic radiographic imaging
systems could provide accurate skeletal kinematics during a wide range of
clinically relevant, daily activities. However, the premise that people move
naturally when followed by a dynamic imaging system has not been evaluated. The
goal of this study was to determine if a close-up robot tracking system affects
natural free-speed gait. 14 healthy adults were recruited to walk through the
workspace of a dynamic radiographic imaging system. Randomized walking trials
were performed with and without the dynamic imaging system tracking the motions
of the subject's left knee. With- and without-robot trials were compared using
detailed temporal-spatial and frequency analysis of kinematic and kinetic
parameters. On average, participants increase their stride length by 0.9 cm.
There also were slight increases in unexplained variation in ankle
flexion/extension and ground reaction forces compared to baseline measurements.
The statistically significant differences indicate that, on average, people tried
to move faster through the workspace of the dynamic radiographic imaging system
while it was actively tracking their motion. These differences are small and
potentially clinically irrelevant.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS