Gait analysis with the Kinect v2: normative study with healthy individuals and comprehensive study of its sensitivity, validity, and reliability in individuals with stroke.
Jorge Latorre, Carolina Colomer, Mariano Alcañiz and 1 others
PMID 31349868WHAT IT FOUND
A low-cost Kinect v2 gait system separated people with stroke from healthy participants, matched clinical walking tests, and flagged higher fall risk.
It can complement clinical assessment, but ankle motion was excluded.
Key findings
01The system detected differences between healthy participants and stroke participants in most spatiotemporal gait values.
02Speed, stride, step, and cadence showed strong or moderate agreement with clinical tests, while step asymmetry did not.
03Speed, stride and step length, stride and step time, and cadence were good predictors of fall risk, while step asymmetry was similar in higher and lower fall-risk groups.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The stroke group had wide variability and uneven age distribution, so the results may not apply evenly across all ages and walking abilities. The walking path included deceleration as participants approached the camera, which may have lowered speed compared with studies that exclude acceleration and deceleration. Ankle kinematics were discarded because the Kinect v2 has poor reliability in ankle detection. Step asymmetry, swing time, double support time, and several kinematic parameters had poor minimal detectable change. Fall risk was categorized using Berg Balance Scale scores, so the fall-risk labels depend on that scale. Reliability was tested only in two subsets of 21 stroke participants.
Declared interests
The supplied text lists funding from Fundació la Marató de TV3 (ES) and Universitat Politècnica de València. It does not provide an author conflict-of-interest declaration.
The easy way to misread this
Do not conclude that the Kinect v2 system predicts actual falls. The higher and lower fall-risk groups were defined by Berg Balance Scale scores.