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New Data Show Lasting Effects and No Serious Adverse Events with a Percutaneous Decompression Procedure for Lumbar Spinal Stenosis Patients


News provided by

American Academy of Pain Medicine

Mar 25, 2011, 06:00 ET

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NATIONAL HARBOR, Md., March 25, 2011 /PRNewswire-USNewswire/ -- Patients treated for lumbar spinal stenosis (LSS) with the mild decompression procedure (an alternative to open spinal surgery for many patients), reported sustained improvements in pain and mobility at one year and had no serious adverse events occur, according to the first multi-center one-year post-study follow-up of this patient cohort. Results from this prospective, evidence-based study were presented today at the American Academy of Pain Medicine's 27th Annual Meeting.

The post-study results were presented by Timothy R. Deer MD, of The Center for Pain Relief in Charleston, West Virginia. Outcomes of the procedure were assessed one year post treatment for all available patients who had participated in the first mild multi-center U.S. clinical trial completed last year. Included in the report were 170 procedures, mostly bilateral at one or two affected levels, in fifty-eight patients who were treated with the mild therapy.

Four validated outcome instruments were used including the Visual Analog Score (VAS), Oswestry Disability Index (ODI), Zurich Claudication Questionnaire (ZCQ), and the SF-12v2® Health Survey. The study patients achieved a significant improvement in pain (40 percent pain reduction) with VAS scoring improving in 79 percent of the patients, from overall mean 7.4 pre-treatment to 4.5 at Year One. Functional mobility also improved in 71 percent of the patients with overall mean ODI improving from 48.6 (severe disability) to 36.7 (moderate disability). The ZCQ and SF-12v2 measures also showed statistically and clinically significant improvements in pain and physical function, as well as satisfaction with overall result after the procedure.

"We did find that the functional criteria, as measured in an objective fashion, were statistically and significantly better after the mild procedure than at baseline," comments Dr. Deer.

Safety was assessed by close patient monitoring for any serious device or procedure-related adverse event. At one year, there were zero significant adverse outcomes such as dural tear, blood transfusion, nerve root damage, or hematoma. The alternative treatment for LSS patients who have failed conservative treatment is open spinal surgery, where there is a 9 to 20 percent rate of serious adverse outcomes, which makes the mild an attractive option for these patients.

"The fact that this is the first one year prospective, evidence-based study is very encouraging because there is very little one-year data on spine procedures in recent literature. This prospective study allowed us to gather data directly from the patients in real time, decreasing the biased data that is often accompanied with retrospective studies," Dr. Deer concludes.

As many as 6 million Americans suffer from LSS, which reduces the space in the spinal canal causing pressure on the nerves, resulting in painful symptoms. Common causative factors include hypertrophic ligamentum flavum, facet hypertrophy, and disc protrusion.

A minimally invasive spine surgery for LSS, the mild procedure utilizes percutaneous access to perform a decompression laminotomy with epidurogram and fluoroscopic image guidance. This procedure restores space and relieves pressure on the spine (spinal decompression) using specialized mild devices and a local anesthetic with conscious sedation.

For more information: www.painmed.org/press

For more than 27 years, the American Academy of Pain Medicine (AAPM) has been the medical specialty society representing more than 2,500 physicians practicing in the field of comprehensive pain medicine. The Academy is involved in education, training, advocacy and research in the specialty of pain medicine. Information is available on the practice of pain medicine at www.painmed.org.

SOURCE American Academy of Pain Medicine

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