78 - Anatomical Substract of the Opponens Pollicis Muscle Myofascial Trigger Points

Poster Board Number: 78
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Co-authors:

Rafael Rocha - graduate student, Surgery, University of São Paulo; Cesar De Alencar - graduate student, Surgery, University of São Paulo; Flávio Hojaij - PhD, Surgery, University of São Paulo; Mauro Andrade - Professor, Surgery, University of São Paulo; Alfredo Jacomo - Head Professor, Surgery, University of São Paulo

Abstract Body :Background: Overuse of social media has significantly increased during the past year and has been related Even though pathophysiology of MTPs still remains unclear, coincidence with muscle motor plate at the innervation zone (IZ) has been reported. Mostly, referred pain and trigger points (TPs) are related to the opponens pollicis muscle (OPP) and our study aimed to describe OPP innervation and ascertain its relationship with clinical described TPs.Methods: OPP muscles from seven cadavers were dissected to observe nerve distribution to the muscle belly. As muscle size may vary among individuals, we established a division of the muscle in quadrants: two superior (I, II) and two inferior (III and IV). Statistical analysis of anatomical data was obtained by Poisson distribution and logarithm link function followed by Bonferroni multiple comparisons. The comparison of points between the sides was made by Mann-Whitney test. Data were presented as mean ± standard deviation, and level of significance was adjusted to 5% (p < 0.05) for all tests. Results: The number of nerve branches did not differ between sides. Quadrants I, II, III and IV did not differ on the number of nerve entry sites either, with a mean of 1±1 for quadrant I and II and III and 0±1 for quadrant IV.Conclusion: The identification of the nerve entry points into the OPP muscle may be a useful guide to locate the myofascial trigger points (MTPs) and provide an anatomical basis for a better understanding of the physiopathology of myofascial disorders and a rational basis for their treatment.