{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,30]],"date-time":"2026-10-30T03:25:36Z","timestamp":1793330736439,"version":"4.5.0"},"reference-count":25,"publisher":"FapUNIFESP (SciELO)","issue":"9","license":[{"start":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T00:00:00Z","timestamp":1567296000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T00:00:00Z","timestamp":1567296000000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T00:00:00Z","timestamp":1567296000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arq. Neuro-Psiquiatr."],"abstract":"<jats:p>ABSTRACT The sciatic nerve forms from the roots of the lumbosacral plexus and emerges from the pelvis passing inferiorly to the piriformis muscle, towards the lower limb where it divides into common tibial and fibular nerves. Anatomical variations related to the area where the nerve divides, as well as its path, seem to be factors related to piriformis syndrome.  Objective: To analyze the anatomical variations of the sciatic nerve and its clinical implications.  Methods: This was a systematic review of articles indexed in the PubMed, LILACS, SciELO, SpringerLink, ScienceDirect and Latindex databases from August to September 2018. Original articles covering variations of the sciatic nerve were included. The level of the sciatic nerve division and its path in relation to the piriformis muscle was considered for this study. The collection was performed by two independent reviewers.  Results: At the end of the search, 12 articles were selected, characterized according to the sample, method of evaluation of the anatomical structure and the main results. The most prevalent anatomical variation was that the common fibular nerve passed through the piriformis muscle fibers (33.3%). Three studies (25%) also observed anatomical variations not classified in the literature and, in three (25%) the presence of a double piriformis muscle was found.  Conclusion: The results of this review showed the most prevalent variations of the sciatic nerve and point to a possible association of this condition with piriformis syndrome. Therefore, these variations should be considered during the semiology of disorders involving parts of the lower limbs.<\/jats:p>","DOI":"10.1590\/0004-282x20190093","type":"journal-article","created":{"date-parts":[[2019,9,25]],"date-time":"2019-09-25T16:48:22Z","timestamp":1569430102000},"page":"646-653","source":"Crossref","is-referenced-by-count":22,"title":["Sciatic nerve and its variations: is it possible to associate them with piriformis syndrome?"],"prefix":"10.1590","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5427-8476","authenticated-orcid":false,"given":"Ana Beatriz Marques","family":"Barbosa","sequence":"first","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7325-5635","authenticated-orcid":false,"given":"Priscele Viana dos","family":"Santos","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0270-447X","authenticated-orcid":false,"given":"Vanessa Apolonio","family":"Targino","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9707-9661","authenticated-orcid":false,"given":"Nathalie de Almeida","family":"Silva","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4901-0096","authenticated-orcid":false,"given":"Yanka Costa de Melo","family":"Silva","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2342-9614","authenticated-orcid":false,"given":"Felippe Barbosa","family":"Gomes","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8725-0456","authenticated-orcid":false,"given":"Thiago de Oliveira","family":"Assis","sequence":"additional","affiliation":[{"name":"Centro Universit\u00e1rio UNIFACISA,  Brasil; Universidade Federal da Para\u00edba,  Brasil; Universidade Estadual da Para\u00edba,  Brasil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"530","published-online":{"date-parts":[[2019,9]]},"reference":[{"issue":"2","key":"ref1","first-page":"27","article-title":"A variation in the high division of the sciatic nerve and its relations with the piriformis muscle","volume":"1","author":"Shailesh P","year":"2011","journal-title":"Natl J Med Res"},{"issue":"1","key":"ref2","first-page":"62","article-title":"Study of the variations in the divisions, course and termination of the sciatic nerve","volume":"2","author":"Shewale AD","year":"2013","journal-title":"J Krishna Inst Med Sci Univ"},{"issue":"3","key":"ref3","first-page":"197","article-title":"Study on anatomical relationships and variations between the sciatic nerve and piriformis muscle","volume":"11","author":"Vicente EJ","year":"2007","journal-title":"Rev Bras Fisioter"},{"issue":"3","key":"ref4","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1007\/s00276-013-1180-7","article-title":"Anatomical variations between the sciatic nerve and the piriformis muscle: a contribution to surgical anatomy in piriformis syndrome","volume":"36","author":"Natsis K","year":"2014","journal-title":"Surg Radiol Anat"},{"issue":"1","key":"ref5","first-page":"46","article-title":"Piriformis syndrome: a review of the literature","volume":"20","author":"Santos CM","year":"2009","journal-title":"J Bras Neurocirurg"},{"issue":"10","key":"ref6","doi-asserted-by":"crossref","first-page":"1003","DOI":"10.1007\/s12630-013-0009-5","article-title":"Brief review: piriformis syndrome: etiology, diagnosis, and management","volume":"60","author":"Jankovic D","year":"2013","journal-title":"Can J Anaesth"},{"issue":"6","key":"ref7","doi-asserted-by":"crossref","first-page":"479","DOI":"10.1007\/s00276-012-0940-0","article-title":"Piriformis syndrome: implications of anatomical variations, diagnostic techniques, and treatment options","volume":"34","author":"Cassidy L","year":"2012","journal-title":"Surg Radiol Anat"},{"issue":"1","key":"ref8","first-page":"29","article-title":"Anatomical variations between sciatic nerve and piriform muscle during fetal period in human","volume":"21","author":"Machado FA","year":"2003","journal-title":"Int J Morphol"},{"issue":"1","key":"ref9","doi-asserted-by":"crossref","first-page":"159","DOI":"10.2307\/2529310","article-title":"The measurement of observer agreement for categorical data","volume":"33","author":"Landis JR","year":"1977","journal-title":"Biometrics"},{"issue":"7103","key":"ref10","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1136\/bmj.315.7103.305","article-title":"Assessing the methodological quality of published papers.","volume":"315","author":"Greenhalgh T","year":"1997","journal-title":"BMJ"},{"issue":"5","key":"ref11","doi-asserted-by":"crossref","first-page":"400","DOI":"10.2519\/jospt.2009.2930","article-title":"Measurement properties of the neck disability index: a systematic review","volume":"39","author":"MacDermid JC","year":"2009","journal-title":"J Orthop Sports Phys Ther"},{"issue":"633","key":"ref12","doi-asserted-by":"crossref","first-page":"633","DOI":"10.1186\/s13104-015-1626-6","article-title":"Anatomical variation in bifurcation and trifurcations of sciatic nerve and its clinical implications: in selected university in Ethiopia","volume":"8","author":"Berihu BA","year":"2015","journal-title":"BMC Res Notes"},{"key":"ref13","article-title":"[Piriformis syndrome and its topographical relationships].","author":"Carnevalli FU","journal-title":"IX Encontro Latino Americano de Inicia\u00e7\u00e3o Cientifica, V Encontro Latino Americano de P\u00f3s-Gradua\u00e7\u00e3o \u2013 Universidade do Vale do Para\u00edva. 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