Ask the subject to seat on the positioning chair.
The shoulder to be tested should be on top. Subject should face away from the dynamometer.
Set the axis of the joint rotation. The axis of rotation for shoulder is through the acromiom, and it
should be right opposite to the colored dot on the input arm of the dynamometer. To succeed the
alignment you might need to make alterations to the positions of the chair and the dynamometer.
Ask the subject to hold the handle and adjust the length of the attachment.
Check the axis of rotation by asking your subject to perform a full adduction/abduction of his/her
shoulder.
Opposite Side
Ask the subject to stop holding the attachment.
While the subject still lies on the chair, slide the chair away from the dynamometer.
Remove the shoulder attachment from the dynamometer input arm and put it back turning it
around.
Adjust the chair and the dynamometer
Follow the steps 6 -8 as described above.
3.4.3. Shoulder Horizontal Adduction/Abduction, Supine
Rotation Axis: a point roughly 2-3 cms below the inferior lip of the acromial arch. However, one should
keep in mind the gleno-humeral joint as a whole moves by an average of 8cm throughout a
movement, therefore the need for accuracy is seriously questioned.
Anatomical Zero: In neutral position with arms at the side of the body
Range of Motion: The normal ROM is between up to 180 degrees adduction and 75 degrees abduction
Isoforce offers one positioning possibility, in supine position.
Muscles Involved: Teres major, latissimus dorsi, Pectoralis major, Middle, Anterior and posterior deltoid
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