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7. The System 4 is a versatile piece of equipment, making it difficult to document every
possible setup position. If a non-documented position is used, document it. If it becomes a
position that is used often, send the information to Biodex.
Proper Testing Technique
1. Verify calibration at least once a month. If data will be used in court or for research,
calibrate and verify before a test is performed.
2. Be consistent in warm-up procedures, commands, setups and instructions, (i.e., Four total
repetitions, first one at 25% effort, second at 50% effort, third at 75% effort and, finally,
100% max effort.)
3. Each patient should perform trial repetitions before each speed to become familiar with
what to expect.
4. Be sure to familiarize the subject with the equipment before testing to eliminate a learning
curve. It is recommended that the patient perform two or three practice sessions on the
system prior to testing.
5. Use proper stabilization techniques, making every attempt to restrict motion only to the
area of interest. Body parts on either side of the joint(s) being rehabilitated or tested should
be firmly secured. Studies have reported significant differences in data generated with and
without stabilization. Uncontrolled movement leads to testing errors. If stabilization devices
are added or removed, document it.
6. Axis alignment of the dynamometer shaft with the subject’s anatomical axis of rotation is
crucial to ensure that during testing and rehabilitation the pattern performed is consistent
with the proper biomechanics of the joint. Correct alignment also helps eliminate stressful
loading of the joint and recruitment of other muscle groups.
7. Use standardized setups. If an unconventional setup is used, document it.
8. Make sure to set the correct anatomical reference angle. The internal goniometer of the
software is based on this reference angle, and is important for later data interpretation.
9. Verbal and visual encouragement should be consistent.
NOTE: Allowing a patient to view the monitor during a test may cause the patient to
change force output based on perception. For testing consistency, it is recommended that
the patient not be allowed to view the monitor.
Set Up and Positioning Videos
Instructional videos on setting up and positioning for the System 4 can be viewed at any time
on your phone, computer, or other devices. These videos will be updated continuously so you
will not need to wait for a software upgrade to see the latest videos:
https://www.biodex.com/videos/mjs-setup
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