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2D Goniometer SmartLead User Manual
15.1.1 Crosstalk
Crosstalk is defined as the ability of the goniometer to measure independently the simultaneous
angular movements of a joint in 2 degrees of freedom. Most of the joints discussed in this manual do
not have crosstalk, with the exception being the wrist and hip. Provided the guidelines on the size
selection and mounting position are followed, crosstalk between the 2 channels will be minimized to
an acceptable level.
Specification of crosstalk for all Biometrics twin axis SG series goniometers is less than 5%
measured over an angular range of 60 i.e. if a joint is moved through 60 from the neutral position
in one plane without movement in the orthogonal plane, then the sensor output in the orthogonal
plane may change by a maximum of 3.
15.2 2D Electrical Goniometer Sensor Application
To secure the goniometer sensor, use the straps included in the shipment, double-sided tape and/or
a flexible bandage that sticks to itself, e.g. Coban. Do not wrap the straps too tight because this can
limit the joint motion. Attach the Ultium Sensor (connected to 2D Goniometer SmartLead) near the
goniometer sensor using double-sided tape, medical tape and/or straps. Do not wrap the probe too
tight because this may affect the signal.
When attaching the goniometer by tape, it is recommended that both single-sided and double-sided
medical tape be used.
1) Place the double-sided tape on the underside of the goniometer's endblock.
2) When the goniometer is attached to the subject, ensure enough allowance is made for the
sliding of the goniometer.
3) Have the subject fully flex the joint so the goniometer is fully extended.
4) Press firmly the two endblocks onto the subject, ensuring the goniometer is lying over the top
of the joint.
5) If the goniometer is compressed too much, e.g. when the joint is fully extended, an "oxbow"
will occur. Reattach the goniometer to prevent the "oxbow".
6) For additional security, wrap the single-sided medical tape one time over the endblock.
No tape should come in contact with the spring!
POSITION 1
15.2.1 Fingers and Toes – Goniometer F35
The F35 goniometer is a single axis goniometer intended for use on fingers and toes. Angles are
measured by rotating one endblock relative to the other about axis X-X. The goniometer is not
designed to measure rotations about Y-Y. The goniometer does not measure rotations about the
axis Z-Z.
(Rev D January 2020)
Oxbow Shape
This results when the sensor is compressed too
much. This can damage the sensor. Do NOT
mount the sensor in this way.
L 1
29
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