Muscles Involved: Hamstrings, Quadriceps
Attachments Needed
Dynamometer: Knee Adaptor (ADL3) with single or double knee pad
Chair: I-shape Adapter (ADS1), Contra lateral Knee Adapter (AdS2)
Set up & Positioning
Put the mechanical stops to “B” blue and “B” red.
Collect the attachments and adapters necessary for this pattern.
Attach Knee Adapter to the dynamometer by sliding it in the input arm from the bottom, long
side. The horizontal part of the adapter should face towards the chair. Start by setting the
adapter high, as it easier to lower it towards the ankle of your subject. Tighten it firmly by
turning the knob placed in the input arm clock wise.
The contra lateral knee adapter is used for the stabilization of the limb that is not exercised or
tested. The contra lateral adapter consists of two parts. Put it on the central stabilizer tube and
tighten it firmly by rotating the knob clock wise.
Ask the subject to be seated. Ensure the for/aft of the bottom seat is correct. By changing this
adjustment you alter the length of the bottom seat. Make sure there is a gap between the
subject's cuff muscle and the seat. Normally a two finger's gap allows a total ROM of 100
degrees.
Attach the thigh straps. Do not attach it too firmly, because the test results can be negatively
affected. Place the other limb behind the pad of the contra lateral adapter. Attach the chest
straps. Note that the chest straps, as well as the contra lateral adapter are optional. However,
their consistent use is important if you want to make comparisons between tests.
Set the axis of the joint rotation. The axis is through the lateral femoral condyle on a sagittal
plane, right opposite to the black 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.
Place the tibia of the subject to the centre of the knee pad. You might need to bring the chair
closer to the dynamometer. Adjust the pad to be at the top of the foot by asking the subject to
maximally dorsiflexion the ankle. Secure the pad at this position, proximal to medial malleoli,
using the strap. This position allows free movement of the ankle.
Check the axis of rotation by asking your subject to fully extend and flex the knee.
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