What causes piriformis syndrome?

Updated: Sep 16, 2020
  • Author: Milton J Klein, DO, MBA; Chief Editor: Ryan O Stephenson, DO  more...
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The etiology of piriformis syndrome can be divided into the following categories:

  • Hyperlordosis

  • Muscle anomalies with hypertrophy

  • Fibrosis (due to trauma)

  • Partial or total nerve anatomical abnormalities

Other causes can include the following:

Piriformis syndrome remains controversial because, in most cases, the diagnosis is clinical, and no confirmatory tests exist to support the clinical findings.

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