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A NASA discovery has current applications in orthopaedics

Identifieur interne : 003D72 ( Pmc/Corpus ); précédent : 003D71; suivant : 003D73

A NASA discovery has current applications in orthopaedics

Auteurs : Howard B. Cotler

Source :

RBID : PMC:4272231

Abstract

Low-level laser therapy (LLLT) has been actively used for nearly 40 yr, during which time it has been known to reduce pain, inflammation, and edema. It also has the ability to promote healing of wounds, including deep tissues and nerves, and prevent tissue damage through cell death. Much of the landmark research was done by the National Aeronautics and Space Administration (NASA), and these studies provided a springboard for many additional basic science studies. Few current clinical studies in orthopaedics have been performed, yet only in the past few years have basic science studies outlined the mechanisms of the effect of LLLT on the cell and subsequently the organism. This article reviews the basic science of LLLT, gives a historical perspective, and explains how it works, exposes the controversies and complications, and shows the new immediately applicable information in orthopaedics.


Url:
DOI: 10.1097/BCO.0000000000000196
PubMed: 25541589
PubMed Central: 4272231

Links to Exploration step

PMC:4272231

Le document en format XML

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<p>Low-level laser therapy (LLLT) has been actively used for nearly 40 yr, during which time it has been known to reduce pain, inflammation, and edema. It also has the ability to promote healing of wounds, including deep tissues and nerves, and prevent tissue damage through cell death. Much of the landmark research was done by the National Aeronautics and Space Administration (NASA), and these studies provided a springboard for many additional basic science studies. Few current clinical studies in orthopaedics have been performed, yet only in the past few years have basic science studies outlined the mechanisms of the effect of LLLT on the cell and subsequently the organism. This article reviews the basic science of LLLT, gives a historical perspective, and explains how it works, exposes the controversies and complications, and shows the new immediately applicable information in orthopaedics.</p>
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<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Curr Orthop Pract</journal-id>
<journal-id journal-id-type="iso-abbrev">Curr Orthop Pract</journal-id>
<journal-id journal-id-type="publisher-id">BCO</journal-id>
<journal-title-group>
<journal-title>Current Orthopaedic Practice</journal-title>
</journal-title-group>
<issn pub-type="ppub">1940-7041</issn>
<issn pub-type="epub">1941-7551</issn>
<publisher>
<publisher-name>Lippincott Williams & Wilkins</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">25541589</article-id>
<article-id pub-id-type="pmc">4272231</article-id>
<article-id pub-id-type="doi">10.1097/BCO.0000000000000196</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Innovations in Practice</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>A NASA discovery has current applications in orthopaedics</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Cotler</surname>
<given-names>Howard B.</given-names>
</name>
<degrees>MD, FACS, FAAOS</degrees>
</contrib>
</contrib-group>
<author-notes>
<corresp>Correspondence to Howard B. Cotler, MD, FACS, FAAOS, 1200 Binz Street, Suite 970, Houston, Texas 77004 Tel: +713-523-8884; fax: +713-523-9075; e-mail:
<email>mgallegos@gulfcoastspinecare.com</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub">
<month>1</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>31</day>
<month>12</month>
<year>2014</year>
</pub-date>
<volume>26</volume>
<issue>1</issue>
<fpage>72</fpage>
<lpage>74</lpage>
<permissions>
<copyright-statement>© 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins</copyright-statement>
<copyright-year>2014</copyright-year>
<license>
<license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc-nd/3.0">http://creativecommons.org/licenses/by-nc-nd/3.0</ext-link>
.</license-p>
</license>
</permissions>
<self-uri xlink:type="simple" xlink:href="bco-26-72.pdf"></self-uri>
<abstract>
<p>Low-level laser therapy (LLLT) has been actively used for nearly 40 yr, during which time it has been known to reduce pain, inflammation, and edema. It also has the ability to promote healing of wounds, including deep tissues and nerves, and prevent tissue damage through cell death. Much of the landmark research was done by the National Aeronautics and Space Administration (NASA), and these studies provided a springboard for many additional basic science studies. Few current clinical studies in orthopaedics have been performed, yet only in the past few years have basic science studies outlined the mechanisms of the effect of LLLT on the cell and subsequently the organism. This article reviews the basic science of LLLT, gives a historical perspective, and explains how it works, exposes the controversies and complications, and shows the new immediately applicable information in orthopaedics.</p>
</abstract>
<kwd-group kwd-group-type="keyword">
<title>Key Words</title>
<kwd>Laser</kwd>
<kwd>LED</kwd>
<kwd>NASA</kwd>
<kwd>orthopaedic</kwd>
<kwd>injury</kwd>
</kwd-group>
<custom-meta-group>
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<meta-name>OPEN-ACCESS</meta-name>
<meta-value>TRUE</meta-value>
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</article-meta>
</front>
<body>
<sec>
<title>BACKGROUND</title>
<p>The pursuit of space travel has opened new areas for study and knowledge. Space medicine has had applications in various subspecialties. Although some think there is little application in orthopaedics, it may be that there has been much discovered but little appreciated. The National Aeronautics and Space Administration (NASA) was established by the United States government in 1958 as a civilian space program for aeronautics and aerospace research.
<xref rid="R1" ref-type="bibr">1</xref>
In 1959 the Astronaut Corps was founded. The insertion of humans into space presented many challenges from a biologic standpoint.
<xref rid="R2" ref-type="bibr">2</xref>
Astronauts in space perform physically demanding work in a challenging environment that includes among other hazards, microgravity, which is known to have an adverse effect on bone and muscle to the extent that it places an increased risk for musculoskeletal injury. There is a threefold higher injury rate during mission periods than outside of mission periods for astronauts, and it has been observed that wounds heal more slowly in orbit.
<xref rid="R2" ref-type="bibr">2</xref>
</p>
<p>In 1993, Quantum Devices (Barneveld, WI) developed a light-emitting diode (LED) for NASA to use in their plant growth experiments.
<xref rid="R3" ref-type="bibr">3</xref>
The experiments demonstrated that red LED wavelengths could boost plant growth, but coincidentally the scientist’s skin lesions began to heal faster as well. NASA subsequently began to study the use of LED to increase the metabolism of human cells and stem the loss of bone and muscle in astronauts.</p>
<p>Dr. Harry T. Whelan, a professor of pediatric neurology at the University of Wisconsin, began the study of LEDs and lasers, receiving grants from NASA and and the National Institutes of Health. He determined that astronauts get four problems: immune deficiency, pituitary insufficiency, delayed wound healing, and muscle and bone atrophy. He observed these results in the laboratory.
<xref rid="R4" ref-type="bibr">4</xref>
–
<xref rid="R7" ref-type="bibr">7</xref>
</p>
</sec>
<sec>
<title>MECHANISMS OF ACTION</title>
<p>From a historical perspective we now know that light has a biologic effect, but what we need to know is how energy from lasers and LEDs work on a cellular level and what the optimal light parameters are for different uses.
<xref rid="R8" ref-type="bibr">8</xref>
</p>
<p>The power plant of cells is located in the mitochondria that are able to produce cellular energy or adenosine triphosphate (ATP) from pyruvate and oxygen.
<xref rid="R9" ref-type="bibr">9</xref>
–
<xref rid="R11" ref-type="bibr">11</xref>
When tissues are stressed or ischemic, mitochondria make their own mitochondrial nitric acid (MtNO), which competes with oxygen. The MtNO bind to cytochrome C oxidase (CcO) that displaces oxygen. This subsequently reduces ATP synthesis and increased oxidative stress, which leads to inflammation.
<xref rid="R12" ref-type="bibr">12</xref>
–
<xref rid="R14" ref-type="bibr">14</xref>
Hypoxic or stressed tissues are affected by LLLT in four stages: (1) light energy is absorbed by cytochrome C oxidase, triggering several downstream effects; (2) nitric oxide is released; (3) ATP is increased; and (4) oxidative stress is reduced.
<xref rid="R15" ref-type="bibr">15</xref>
These biochemical intermediates affect components in the cytosol, cell membrane, and nucleus that control gene transcription, cell proliferation, migration necrosis, and inflammation.
<xref rid="R16" ref-type="bibr">16</xref>
Cells in blood and lymph, which have been light activated, can travel a distance for systemic effects.
<xref rid="R17" ref-type="bibr">17</xref>
,
<xref rid="R18" ref-type="bibr">18</xref>
</p>
</sec>
<sec>
<title>APPLICATIONS</title>
<p>The four common targets for LLLT are:</p>
<list list-type="bullet">
<list-item>
<p>L – lymph nodes to reduce edema and inflammation.
<xref rid="R19" ref-type="bibr">19</xref>
</p>
</list-item>
<list-item>
<p>I – site of injury to promote healing and reduce inflammation.
<xref rid="R17" ref-type="bibr">17</xref>
,
<xref rid="R18" ref-type="bibr">18</xref>
</p>
</list-item>
<list-item>
<p>N – nerves to induce analgesia.
<xref rid="R20" ref-type="bibr">20</xref>
–
<xref rid="R22" ref-type="bibr">22</xref>
</p>
</list-item>
<list-item>
<p>T – trigger points to reduce muscle spasms.
<xref rid="R23" ref-type="bibr">23</xref>
,
<xref rid="R24" ref-type="bibr">24</xref>
</p>
</list-item>
</list>
<p>LLLT is a transcutaneous procedure with no invasive portion. The physician determines the correct synchronizations of continuous or pulsed laser emission. Penetration depth is determined by wavelength and power. The U.S. Navy research determined 810 nm to be optimal for penetration.
<xref rid="R25" ref-type="bibr">25</xref>
Treatment times are in the range of 30 s to 1 min, but there are many areas treated for comprehensible protocol, which often takes approximately 30 min to perform. For stimulating repair and decreasing inflammation, 2.5 Hz pulse is recommended, while a continuous beam is ideal for analgesia and tender points.</p>
</sec>
<sec>
<title>ADMINISTRATION</title>
<p>The Federal Drug Administration (FDA) approved the use of LLLT in 2003. In some states, a prescription is mandatory before treatment. Treatment can be administered by a certified therapist, radiology technologist, or a physician. European sports therapists have used LLLT for over a decade; however, they report only a 50% success rate,
<xref rid="R26" ref-type="bibr">26</xref>
,
<xref rid="R27" ref-type="bibr">27</xref>
which may be due to inconsistent laser parameters and dose. Recent advances by researchers at Harvard Medical School have clarified the mechanism by which there is biphasic dose response.
<xref rid="R28" ref-type="bibr">28</xref>
,
<xref rid="R29" ref-type="bibr">29</xref>
</p>
<p>Side effects and complications can result from traditional treatments for musculoskeletal pathology. Nonsteroidal antiinflammatories can cause ulcer disease, hypertension, bleeding, and cardiac events. Steroids (oral and/or epidural) can result in infections (including epidural), bleeding, ulcers, avascular necrosis, and tissue fragility. Studies have found LLLT to have no side effects or adverse events beyond those reported for placebo.
<xref rid="R30" ref-type="bibr">30</xref>
</p>
<p>With over 4000 basic science research and clinical studies according to pubmed.gov, and low complication rate, LLLT should be considered as a first-line treatment option for conditions such as acute neck or back pain, tendinitis, plantar fasciitis, mild carpal tunnel sndrome, and ligamentous sprains.
<xref rid="R30" ref-type="bibr">30</xref>
–
<xref rid="R33" ref-type="bibr">33</xref>
Its safety profile provides a persuasive argument, with the added benefits of accelerated healing, tissue remodeling, pain relief, and decreased inflammation. LLLT subsequently has been accepted by both the British and Canadian health services. Although approved by the FDA, LLLT has not been recognized or accepted by Medicare or insurance companies because it is viewed as investigational treatment.</p>
<p>Clinical practice guidelines of the American Academy of Orthopaedic Surgeons (AAOS) in 2008 on treatment of carpal tunnel syndrome included laser treatment but carried no recommendations for or against its use because there is insufficient evidence.
<xref rid="R34" ref-type="bibr">34</xref>
The literature on LLLT for the treatment of lymphedema, wound healing, prevention of oral mucositis, or for pain demonstrates inconsistent results and methodological weaknesses as per the Blue Cross Blue Shield of Kansas Medical Policy, March 12, 2013. More up-to-date, prospective studies, using newer treatment guidelines by clinicians, are needed to provide a complete picture of efficacy and cost-effectiveness.</p>
</sec>
<sec sec-type="conclusions">
<title>CONCLUSION</title>
<p>LLLT will not replace orthopaedic surgery for structural pathology, but it may be useful as an adjunct therapy for patients seeking noninvasive symptomatic treatment or accelerated wound healing.</p>
</sec>
</body>
<back>
<fn-group>
<fn fn-type="other">
<p>Financial Disclosure: Dr. Cotler is in private practice and owns Gulf Coast Spine Care Ltd., PA and Laser Health Spa, LLC. He received no financial suport for this manuscript.</p>
</fn>
</fn-group>
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