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Agape Healing Arts

Health & Wellness Center

385 Tequesta Drive Ste. 4 Tequesta FL 33469 ~ Office 561-762-4273

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Digital Infrared Thermal Imaging in Sports Medicine & Musculoskeletal Disorders

Posted on May 28, 2020 at 10:45 PM

DITI has been shown to be useful as a diagnostic tool in the differential diagnosis of neuromusculoskeletal injuries and their prognosis for return to participation and/or competition. Since DITI is noninvasive, risk-free, and totally portable, it is a very practical tool in the clinical setting and may be used in the sports medicine clinic, private practice or the training room to assess injury and make clinical decisions. DITI not only helps confirm a diagnosis, but can be used as a gauge to clinically assess progress and treatment response, as well as a prognostic indicator. DITI is useful for, but not limited to, the diagnosis and evolution of epicondylitis, patellofemoral syndromes, ankle injuries, shin splints, stress fractures, myofascial pain syndromes, spinal pain syndromes, shoulder injuries, foot pain syndromes, and vascular disorders. One of DITI's biggest contributions to sports medicine is in the detection of the posttraumatic pain syndromes of reflex sympathetic dystrophy (complex regional pain syndrome) and sympathetic maintained pain syndromes which can occur after minimal injury. These have traditionally been difficult to diagnose. DITI provides an invaluable window into the autonomic ? sympathetic nervous system, which records via somatocutaneous reflex, the sympathetic response to pain and injury.

 


The controlling mechanism for thermal emission and dermal microcirculation is the sympathetic nervous system. There is a persistent vasomotor tone in the peripheral arterioles and precapillary sphincters. This tone allows the dermal vessels to stay in a partially constricted state so as to inhibit excess heat loss from a higher core temperature. The autonomic regulation involves synapse of preganglionic sympathetic fibres to postganglionic. The postganglionic fibres travel to vascular structures and modulate alpha receptor function in the dermal microcirculation. When there is increased sympathetic function vasospasm will occur due to further vessel constriction and there will be decreased thermal emission at the cutaneous level. This may occur due to either increased postganglionic fibres function/irritation or hypersensitization of the alpha receptors in the dermal microcirculation allowing increased binding of catecholamines. Increased thermal emission will conversely be seen due to situations of decreased postganglionic function (such as seen in denervation) or alpha receptor blockade (receptor fatigue due to release of vasoactive substances such as substance P) .

Muscle, joint, osseous, ligament and nerve injuries all cause the patient to perceive pain. Pain sensation is carried by afferent stimulation of C-nociceptors. These unmyelinated fibres do have a percentage of sympathetics. Pain is then processed centrally and to the brain via the spinothalamic tracts. The patient may feel pain at the area of injury and at sites distant to the area of injury. This is called referred pain. Much research has been done documenting referred pain in myofascial syndromes and somatic visceral conditions. These referred pain zones are believed to be a somatocutaneous sympathetic response. They work via a common autonomic neural network. The somatosympathetic response can be imaged by DITI. Pain is believed to be a neurogenic and autonomic response to injury. DITI findings have been found to correlate well to the patient's report of painful areas and is well suited for diagnostic purposes in athletic injuries. DITI is not a picture of pain, however it is a picture of autonomic dysfunction which seems to correlate well with regions of pain.

 


Pain felt at the area of injury is generally seen to be hyperthermic (increased thermal emission) due to decreased sympathetic function and alpha receptor blockade from posttraumatic metabolic by-products such as substance P, kinins, histamines, etc. This could be called a somatocutaneous reflex.

Areas of referred pain are generally seen to be hypothermic (decreased thermal emission) due to increased sympathetic function.

DITI has been recognised as a viable diagnostic tool since 1987 by the AMA council on scientific affairs, the ACA council on Diagnostic Imaging, the Congress of Neurosurgeons in 1988 and in 1990 by the American Academy of Physical Medicine and Rehabilitation.  A number of studies have been done to determine DITI’s interexaminer reliability and validity. A study of DITI in low back pain patients found 96% interobserver reliability. In a study of patients with knee pain, 98% test efficiency and 94% interrater reliability was found.

DITI has good clinical utility, is cost effective, risk-free and provides instantaneous real time imaging. DITI should be used by doctors treating common disorders for diagnostic and assessment purposes. While many doctors do not own diagnostic equipment, most major cities and suburban areas have experienced thermographers that will give the referring doctor access to this useful technology and diagnostic test. Major medical centre hospitals should have a thermal imaging department available for referral, and it is hoped that now medical DITI has become more economic it will allow doctors to maximise their specialist skills through access to this objective test of physiology and ultimately benefit their patients.

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