http://www.jneuroengrehab.com/content/9/1/64/abstract
Abstract (provisional)
Background
Self-reported gait unsteadiness is often a problem in neurological patients without
any clinical evidence of ataxia, because it leads to reduced activity and limitations
in function. However, in the literature there are only a few papers that address this
disorder. The aim of this study is to identify objectively subclinical abnormal gait
strategies in these patients.
Methods
Eleven patients affected by self-reported unsteadiness during gait (4 TBI and 7 MS)
and ten healthy subjects underwent gait analysis while walking back and forth on a
15-m long corridor. Time-distance parameters, ankle sagittal motion, and muscular
activity during gait were acquired by a wearable gait analysis system (Step32, DemItalia, Italy) on a high number of successive strides in the same walk and statistically processed.
Both self-selected gait speed and high speed were tested under relatively unconstrained
conditions. Non-parametric statistical analysis (Mann--Whitney, Wilcoxon tests) was
carried out on the means of the data of the two examined groups.
Results
The main findings, with data adjusted for velocity of progression, show that increased
double support and reduced velocity of progression are the main parameters to discriminate
patients with self-reported unsteadiness from healthy controls. Muscular intervals
of activation showed a significant increase in the activity duration of the Rectus
Femoris and Tibialis Anterior in patients with respect to the control group at high
speed.
Conclusions
Patients with a subjective sensation of instability, not clinically documented, walk
with altered strategies, especially at high gait speed. This is thought to depend
on the mechanisms of postural control and coordination. The gait anomalies detected
might explain the symptoms reported by the patients and allow for a more focused treatment
design. The wearable gait analysis system used for long distance statistical walking
assessment was able to detect subtle differences in functional performance monitoring,
otherwise not detectable by common clinical examinations.
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