Noraxon myoMOTION 682 User Manual page 13

Noraxon U.S.A., Inc.
Any sensor configuration is supported; even single sensor or two distant
sensor measures (left and right foot only) are possible. But we recommend
whenever possible to start with the Pelvic or Upper thoracic sensor and
create uninterrupted sensor chains to distal segments.
Note: anatomical angles can only be calculated if at least two sensors are
located around the joint.
If the Pelvic or Upper thoracic sensors are available, any distal sensor
can be mounted to any position of the selected segment. We recommend
positions that best follow the bone movement and are not too much
influenced by muscle belly movements. Whenever possible the sensors
should have sticky skin contact and not move against the bone (s).
If Pelvic or Upper Thoracic sensors are not used,
it is needed to exactly position extremity sensors
lateral and orientation to the underlying bone
axis.
Please also note that the distance of a given
sensor to the joint center does not influence the
angular calculations in both of the above
mentioned modes.
Calibration of myoMOTION sensors
The calibration procedure defines the 0° point or 90° point (dependent of calibration position) of the
angular displacement that is measured by each myoMOTION sensor. Any calibration position should be
arranged as accurate as possible. For example, if in standing straight position the knee joint cannot be
brought to the neutral zero joint position; there will be an angle offset error in each angle measured later
on.
Cal-Position
Standing straight:
All joints are in
„neutral" zero
position, thumbs in
view direction
The calibration position needs to be kept until the audio cues indicate the calibration is complete.
P-6828 Rev A (Oct 2014)
Cal-Position Standing
–flexed arm:
As above, but elbow is
flexed 90°
myoMOTION Data Logger
Cal-Position
Seated
Elbow, hip and
knee are 90°
flexed
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