Low Back Pain Clinical Trial
Official title:
New Approaches in Evaluating Patients' Response to Botulinum Toxins in the Treatment of Chronic Neck Pain and Back Pain
This protocol is a prospective, open label, pilot study examining the utility of three established pain questionnaires (the Visual Analogue Scale (VAS), Neck Disability Index (NDI), the Oswestry Low Back Pain Questionnaire and two novel pain scale devised by the PI) as well as their relationship to three novel quantitative tools to measure the effect of botulinum toxin injections for neck pain and back pain. The three novel methods for measuring neurotoxin effect are: muscle twitch patterns using surface electromyography (sEMG), cervical and lumbar range of motion using a neck and low back inclinometer, and skin surface temperature readings using an infrared imaging camera.
Botulinum toxins are a well-established group of neurotoxins that have a wide variety of FDA
approved clinical uses including muscle relaxation, headache prevention and bladder control.
Despite the abundance of anecdotal evidence supporting their use in pain management, double
blind placebo control studies examining the efficacy of botulinum toxins in the treatment of
chronic neck and back pain have reported mixed findings. Several smaller studies have shown
significantly positive outcomes while other studies have found no efficacy of neurotoxins
compared to placebo. The existing literature reveals that most negative outcome studies were
based on the Visual Analogue Scale, which is a purely subjective measure. We propose a more
objective set of measures that might better reflect patients' deficits and levels of
discomfort.
Our proposal is a prospective, open-label, pilot study that will examine chronic neck and
back pain among veterans. Our primary specific aim is to test three novel methods for
evaluating clinical deficits in patients who have chronic neck and back pain:
electromyographical (EMG) activity (primary outcome) and cervical/lumbar range of motion
(CROM & LROM) (primary outcome) as well as skin surface temperature (thermography) (secondary
outcome). Our hypothesis is that most patients with chronic neck and back pain significantly
from sustained muscle spasms. As a result, patients may exhibit surplus EMG activity in
affected areas due to spontaneous muscle twitch. And consequently, they may show signs of
decreased range of motion due to increased muscle tone. They may also experience a rise in
skin surface temperature due to excess heat production from sustained muscle contraction. We
will measure these three phenomena using three different biophysical measurement tools.
Electromyographic data will be collected with a surface EMG device, and cervical and lumbar
range of motion with a gravity inclinometer. Skin surface temperature will be assessed with a
medical grade digital thermography camera.
The second specific aim of this study is to examine the efficacy of botulinum toxins in
reversing the anomalies in the above measured parameters: to reduce excessive
electromyographic activity, to increase range of motion in cervical and lumbar joints and to
reduce elevated skin surface temperature. We will measure outcomes of 60 study subjects (30
for neck pain and 30 for low back pain) who will all be treated once with botulinum toxins
and then followed up at 1 month, 2 months and 3 months. We will also correlate our findings
with the more commonly used pain and function scales: the Visual Analogue Scale, Neck
Disability Index and the Oswestry Low Back Pain Scale.
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