McGill: A commonly used device found in living rooms around the world could be a cheap and effective means of evaluating the walking difficulties of multiple sclerosis (MS) patients. The Microsoft Kinect is a 3D depth-sensing camera used in interactive video activities such as tennis and dancing. It can be hooked up to an Xbox gaming console or a Windows computer. A team of researchers led by McGill University postdoctoral fellow Farnood Gholami, supervised by Jozsef Kövecses from the Department of Mechanical Engineering and Centre for Intelligent Machines, collaborated with Daria Trojan, a physiatrist in the Department of Neurology and Neurosurgery working at the Montreal Neurological Institute and Hospital, to test whether the Kinect could detect the differences in gait of MS patients compared to healthy individuals.
In current clinical practice, the walking movement of MS patients is
usually assessed by their doctors, and subjective evaluations may
distort results: two different clinicians may give the same patient
different evaluations. Using a camera that detects movement and computer
algorithms that quantify the patients’ walking patterns can reduce
potential for human error.
Gholami captured the movement of 10 MS patients and 10 members of an
age-and-sex-matched control group using the Kinect device. The MS
patients had previously been assessed for gait abnormalities using the
traditional clinician method.
Using the data, the team then developed computer algorithms that
quantified gait characteristics of MS patients and healthy people. The
investigators found that gait characteristics measured with the Kinect
camera and analyzed with the developed algorithms were reproducible when
assessed at one visit and were different between MS patients and the
healthy individuals. Moreover, the gait characteristics of MS patients
obtained by the algorithm were correlated with clinical measures of
gait. In addition, the algorithms could mathematically define the
characteristics of gait in MS patients at different severity levels,
accurately determining his/her level of gait abnormality.
Gholami says he became interested in using motion capture technology
for clinical purposes as a PhD student, but the equipment he was using
at the time was very expensive, difficult to use, and non-portable,
making widespread clinical use prohibitive. The Kinect device gave him
an inexpensive tool to use that appears to be still accurate enough to
do the job.
“This tool may help the clinician provide a better diagnosis of gait
pathology, and may be used to observe if a prescribed medication has
been effective on the gait of the patient or not,” he says. “Our
developed framework can likely be used for other diseases causing gait
abnormalities as well, for instance Parkinson’s disease.”
Trojan says the tool could be useful “to assess treatment effects of
certain interventions such as rehabilitation or medication, and to
document MS disease progression as reflected by gait deterioration. It
may also be useful as a measure in clinical trials.”
Gholami says the next step is to conduct a study with a larger group
of MS patients, including evaluation in a gait laboratory, using a newer
version of the Kinect device that promises to improve accuracy.
This work was completed in collaboration with Behnood Gholami at
AreteX Systems Inc., Hoboken, NJ, and Wassim M. Haddad at Georgia
Institute of Technology, Atlanta, GA.
The full research paper was published in the IEEE Journal of Biomedical and Health Informatics
on July 21, 2016. This research was made possible with funds from the
Natural Sciences and Engineering Research Council of Canada.