Background: The "90/90 test" is extensively used by health care professionals to screen potential candidates for 90/90 supine distraction therapy. The test is easy to perform, and takes only minutes to do. (See side bar). A positive test (relief from pain) indicates the potential success of treatment with the 90/90 supine distraction treatment system.
This specialized treatment system derives its name from the precise body positioning provided by the equipment: 90 degrees at the hips and 90 degrees at the knees, combined with pelvic tilt.
The Phillips Institute of Technology conducted a study to determine the correlation between a positive 90/90 test and successful treatment of chronic low back pain using 90/90 supine distraction.
Methods: Twenty-one patients with chronic low back pain (longer then three months duration and unresponsive to regular chiropractic management) completed a pain scale questionnaire, full case history, and complete physical examination, including the 90/90 test. Seven patients had a negative (increase in pain) 90/90 test. Fourteen patients had a positive (decrease in pain) 90/90 test.
All patients, including those with a negative 90/90 test, were randomly assigned to two groups. Group one had six consecutive days of 90/90 supine distraction treatment. The first 90/90 treatment session lasted ten minutes. Sessions were increased by 5 minutes each to a maximum of 30 minutes.
Group 2 had 8 consecutive 90/90 treatments, the first lasting 15 minutes. Sessions were increased in 15 minute increments to a maximum of 60 minutes. Both groups were re-evaluated after the last 90/90 treatment session.
Results: Of the 7 who had a negative 90/90 test, a 45 percent had an increase in pain with 90/90 treatment, and 55 percent had a decrease in pain. Of those having a positive 90/90 test, none had an increase in pain. In fact, 90 percent had a decrease in pain with 90/90 treatment. The remaining ten percent had no change in pain.
Conclusions: The results indicate that a positive 90/90 test is an extremely reliable indicator of therapeutic (pain relieving) benefit of the 90/90 supine distraction treatment program.
As such, this simple test should be incorporated into every doctor's screening procedure for patients with chronic low back pain. When the test is positive, the patient can benefit from 90/90 supine distraction treatment. With the proper equipment, this program can be easily administered in the clinic, and can also be used at home.
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