[Note: See an explanation of “The Difference Between Tender Points and Trigger Points,” by Karen Lee Richards.]
The aim of this present study is to test the hypotheses that the 18 predetermined sites of examination for tender points (TP sites) in fibromyalgia syndrome (FMS) are myofascial trigger points (MTrPs), and that the induced pain from active MTrPs at TP sites may mimic fibromyalgia pain.
Each TP site was evaluated with manual palpation followed by intramuscular electromyographic (EMG) registration of spontaneous electrical activity to confirm or refute the existence of an MTrP in 30 FMS patients. Overall spontaneous pain intensity and pain pattern were recorded before manual identification of MTrPs. Local and referred pain pattern from active MTrPs were drawn following manual palpation at TP sites.
Results: Showed that most of the TP sites are MTrPs. Local and referred pain from active MTrPs reproduced partly the overall spontaneous pain pattern. The total number of active MTrPs (r = .78, P < .0001), but not latent MTrPs (r = -.001, P = .99), was positively correlated with spontaneous pain intensity in FMS. The current study provides first evidence that pain from active MTrPs at TP sites mimics fibromyalgia pain. MTrPs may relate to generalized increased sensitivity in FMS due to central sensitization. Perspective: This article underlies the importance of active myofascial trigger points in FMS patients. Most of the tender point sites in FMS are myofascial trigger points. • Active myofascial trigger points may serve as a peripheral generator of fibromyalgia pain, • And inactivation of active myofascial trigger points may thus be an alternative for the treatment of FMS. Source: Journal of Pain, Nov 13, 2009. PMID: 19914876, by Ge HY, Wang Y, Danneskiold-Samsøe B, Graven-Nielsen T, Arendt-Nielsen L. Parker Institute, Frederiksberg Hospital, Frederiksberg, Denmark; Laboratory for Musculoskeletal Pain and Motor Control, Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark. [E-mail: email@example.com]