The FAIR (Flexion, Adduction, and Internal Rotation) test is a provocation test specifically designed for diagnosing piriformis syndrome. It reproduces symptoms by stretching the piriformis muscle, The FAIR (Flexion, Adduction, and Internal Rotation) test is a provocation test specifically designed for diagnosing piriformis syndrome. It reproduces symptoms by which may compress or irritate the sciatic nerve. The FAIR (Flexion, Adduction, and Internal Rotation) test is a provocation test specifically designed for diagnosing piriformis syndrome. It reproduces symptoms by sciatic nerve. This test has been validated as a reliable diagnostic too has been validated as a reliable diagnostic tool in piriformis-related case