(1) Clinical research of Airtrac
(published, 'Radiology', Dec. 2002.)
 (page 895~900)  .pdf

       (1_1)          .ppt

     (2) Pictures for Correct MRI technique ( 3 MB) for Lumbar

     (3) Pictures for Correct MRI technique ( 2 MB) for Lumbar

     (4) Pictures for Correct MRI technique ( 1 MB) for Cervical

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esearch on the effects of the ambulatory aerodynamic cervical traction apparatus in disc patients with MRI .

Chang June, Park³ M.D. President
Airtrac MSI Inc.

# Purpose : To evaluate the reducibility of HCD during traction, we designed an air-traction device with non-magnetic (non-metalic) materials for use in MR machine.

# Method and Materials:
Cervical spine MR images were obtained from twenty-three paients and seven volunteers with the application of the air-traction device that was placed in the gantry during scanning. We designed the air-traction device for cervical spine with an equivalent of 50-pound-weight. All of the patients and volunteers took MR images during neutral and traction state. We compared the length of cervical spine from C1 to C7 and examined the reducibility of HCD on traction vs . neutral position.

Results: The MR images of seven volunteers showed an increasement in the height of cervical spine from 1.5  to 4.5 mm with the mean of 2.86mm during the traction.  Seventeen of twenty-three patients showed an increasement in height from 1 to 9mm with the mean of 2.4mm, while remaining ten showed non response during the traction.Three(13%) of twenty-three patients showed the complete reduction of HCD during the traction. Ten (43%) patients showed partially reduced HCD and remaining ten (43%) did not show any reducibility of HCD.

# Conclusions: The force of the air-traction device was effective for reduction of HCD on thirteen (57%) of twenty-three patients during the cervical spine MR imaging. The cervical spine MRI with the application of air-traction device can be an effective method to find reducible HCD.


* App. : This result was not obtained in the primary or secondary hospital but was done in University Hospital, one of the major terminal hospitals, patients from  Radiology Dept. (Rehabilitation Dept., Neurosurgery dept. Orthopedic patients, serious in-patients), so there may be difference in actual ratio of HNP disc patients.
It is the result with Airtrac traction treatment only, not using hyperthermal treatment or muscle relaxants. If that therapy was done before traction, the treatment effect may be better.
 Also the MRI was taken right after the traction treatment begun. But, if it was taken after traction treatment for 25 minutes, the result was better. However, it was impossible because the university hospital is too busy to delay MRI schedule for full time traction, 25 minutes.
 Now, the clinical research for lumbar one is processing. The start of lumbar research was delayed due to some technical reason. For example, a sliding device under pelvis was needed and the MR-lumen is not wide for patients to keep the semi-Fowler`s position.
This clinical research was reported on 11:12 AM. 29, Nov. on RSNA-2000, in Chicago convention center.