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Piriformis syndrome occurs when the piriformis irritates the sciatic nerve, which comes into the gluteal region beneath the muscle, causing pain in the buttocks and referred pain along the sciatic nerve. [8] This referred pain is known as sciatica. Seventeen percent of the population has their sciatic nerve coursing through the piriformis muscle.
The muscle extends to each side of your body and is used in almost every movement of the lower body. The sciatic nerve, which is the longest nerve in a person’s body, runs underneath the piriformis.
The piriformis is a flat, pear-shaped muscle. The thicker side of the piriformis is medial (closer to the center of the body). The function of the piriformis is as an external thigh rotator.
According to the National Institutes of Health (NIH), piriformis syndrome "is a rare neuromuscular condition that occurs when the piriformis muscle in the buttocks presses on the sciatic nerve ...
Piriformis syndrome occurs when your piriformis muscle compresses your sciatic nerve and results in inflammation. It can cause pain or numbness in your buttock and down the back of your leg.
As an example of the diagnostic improvement of MRN, when MRI is used to assess piriformis muscle asymmetry, it has 46% sensitivity and 66% specificity for piriformis syndrome. When MRN is used and includes unilateral sciatic nerve hyperintensity at the sciatic notch, the sensitivity increases to 64% and the specificity increases to 93%. [ 3 ]
According to Harvard Health, piriformis syndrome "develops due to irritation or compression of the sciatic nerve near the piriformis muscle." The condition is more common in women. The condition ...
The lateral rotator group is a group of six small muscles of the hip which all externally (laterally) rotate the femur in the hip joint.It consists of the following muscles: piriformis, gemellus superior, obturator internus, gemellus inferior, quadratus femoris and the obturator externus.