If we are ever going to consistently recover hand function we need something like this to establish the baseline problems and then document exactly what stroke protocol creates recovery.
Assessment of hand kinematics using inertial and magnetic sensors
Journal of NeuroEngineering and Rehabilitation 2014, 11:70
doi:10.1186/1743-0003-11-70
Published: 21 April 2014
Published: 21 April 2014
Abstract (provisional)
Background
Assessment of hand kinematics is important when evaluating hand functioning. Major
drawbacks of current sensing glove systems are lack of rotational observability in
particular directions, labour intensive calibration methods which are sensitive to
wear and lack of an absolute hand orientation estimate.
Methods
We propose an ambulatory system using inertial sensors that can be placed on the hand,
fingers and thumb. It allows a full 3D reconstruction of all finger and thumb joints
as well as the absolute orientation of the hand. The system was experimentally evaluated
for the static accuracy, dynamic range and repeatability.
Results
The RMS position norm difference of the fingertip compared to an optical system was
5?0.5 mm (mean ? standard deviation) for flexion-extension and 12.4?3.0 mm for combined
flexion-extension abduction-adduction movements of the index finger. The difference
between index and thumb tips during a pinching movement was 6.5?2.1 mm. The dynamic
range of the sensing system and filter was adequate to reconstruct full 80 degrees
movements of the index finger performed at 116 times per minute, which was limited
by the range of the gyroscope. Finally, the reliability study showed a mean range
difference over five subjects of 1.1?0.4 degrees for a flat hand test and 1.8?0.6
degrees for a plastic mold clenching test, which is smaller than other reported data
gloves.
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