IN PART ONE OF THIS SERIES, we discussed the phenomenon known as phantom limb pain. [See April 2016 ACA News, “Phantom Limb Pain, Caring for Patients with Amputations (Part I),” Page 28 at http://mydigimag.rrd.com/publication/?i=295043.] That article laid the foundation for what follows. It essentially revealed that there is a strong connection between the brain’s awareness of the body and vision. The brain coordinates its perception of self through the combined senses of proprioception and sight. When conflict occurs between what the brain expects to see, proprioception, and the reality of a missing limb, phantom limb pain can result.1 Recognizing the distinct visual association between the brain and the neuromatrix and how strongly the interactive sense of self responds to visual cues, researchers have developed a simple non-pharmaceutical treatment for phantom limb pain. That treatment is mirror therapy.
Mirror therapy utilizes a mirror placed in such a way that the patient can look in the mirror and see the mirror image of the non-amputated limb instead of the missing extremity. Somehow this treatment is successful in reducing or eliminating phantom limb pain. The mirror tricks the brain into thinking that the missing limb is still there, resulting in a significant therapeutic response. For many patients, the phantom limb pain resolves or the intensity of the pain decreases.
In one randomized controlled study, every one of the amputees in the mirror therapy group showed a reduction in phantom limb pain.2 The therapy consisted of 15 minutes of mirror therapy, five days per week for four weeks. While this study was done with the most basic of equipment, a mirror, the success of this study and others has led to the production of mirror systems specifically created to treat phantom limb pain. Mirror boxes and inflatable mirror boxes are now available commercially.
In cases of bilateral amputation, there is no limb to mirror. For this, the use of a surrogate has proven effective. Essentially the patient sees the limbs or mirror images of the limbs of another person, a surrogate.3
Research is continuing to uncover the mysteries of the neuromatrix, pain and phantom limb pain. Studies currently underway are using advanced brain imagery to determine the effects of mirror therapy on the somatosensory cortex of the brain. In the future, expect to see a refined explanation of phantom limb pain, the utilization of mirror therapy, and in all likelihood, the use of visual goggles and virtual reality to treat patients with phantom limb pain and other conditions.
As research continues, doctors of chiropractic (DCs) can anticipate the expansion of non-invasive and non-pharmaceutical treatment of phantom limb pain. DCs can also expect to see the knowledge gained in treating phantom limb pain applied to other pain syndromes. It will certainly be exciting to see the trend of supporting and enhancing the brain’s own innate self-healing and the increased reliance on neural plasticity over the use of pharmaceuticals.
While research has shown success in treating phantom limb pain with mirror therapy, I expect that other conditions such as strokes, denervation, mangled limbs, complex regional pain syndromes4,5 and cerebral palsy will also be treated with mirror therapy, and eventually with virtual reality therapy using goggles. These types of therapy are in alignment with chiropractic’s historic philosophy of avoiding the unnecessary use of drugs and our desire to normalize neural tone and function.
Certainly with hundreds of chiropractic physicians now working in the VA and DoD health care systems and with an increasing number of veterans entering the civilian sector of health care, it is very likely that chiropractors will work with patients with (war-wounded) amputations and phantom limb pain. Chiropractic physicians should be well-versed in the unique neurological and physiological nuances associated with amputations as well as with the mechanical changes that are manifested by these patients.
The views expressed in this article are those of the author and do not necessarily reflect the official policy or position of the Department of the Navy, Department of the Army, Department of Defense nor the U.S. Government.
I acknowledge and thank the Defense Video and Imagery Distribution System (DVIDS) for providing the photographs accompanying this article (Figures 1 and 2). This work, “Mirror Therapy Shows Promise in Amputee Treatment,” by Donna Miles, identified by DVIDS, is free of known copyright restrictions under U.S. copyright law.
Additionally, I thank Paul Pasquina, MD, and Jack Tsao, MD, for their work in advancing the state of the science in treating phantom limb pain and other pain syndromes. I thank them for freely engaging with me and sharing their knowledge as I try to understand their work.
1) Ramachandran VS, Hirstein W. The perception of phantom limbs. Brain. 1998;121:1603-1630.
2) Chan BL, Witt R, Charrow AP, Magee A, Howard R, Pasquina PF, Heilman KM, Tsao JW. Mirror therapy for phantom limb pain. N Engl J Med. 2007;357:2206-2207.
3) Tung ML, et al. Observation of limb movements reduces phantom limb pain in bilateral amputees. Annals of Clinical and Translational Neurology. 2014;1: 9: 633–638.
4) McCabe CS, Haigh RC, Blake DR. A controlled pilot study of the utility of mirror visual feedback in the treatment of complex regional pain syndrome (type 1). Current Pain and Headache Reports. April 2008; 12(2):103-107.
5) Al Sayegh S, et al. Mirror therapy for Complex Regional Pain Syndrome (CRPS)—A literature review and an illustrative case report. Scandinavian Journal of Pain. 4(4):200-207.
Dr. William Morgan divides his clinical time between a hospital-based chiropractic clinic and executive health clinics in Washington, D.C. He is adjunct faculty for a medical school and several chiropractic colleges. He is on the board of trustees for Palmer College of Chiropractic. His speaking calendar can be viewed at http://bethesdaspineinstitute.com. He can be reached through his website, www.drmorgan.info.