Characteristics: People complain of pain in the buttocks and posterolateral thighs, sometimes radiating to the lower limbs and perineum, which is obvious when the lower limbs are moved. Physical examination showed a positive or suspiciously positive straight leg raise test, a positive lower limb external rotation test, and tenderness in the middle and lower part of the buttocks. Most patients are ineffective in treating intervertebral disc herniation for a long time.

When the piriformis muscle undergoes spasm and swelling after being subjected to long-term compression, trauma, strain, or exposure to cold, and an aseptic inflammatory reaction occurs, followed by contracture, adhesion, etc., it will compress the sciatic nerve and cause a disease similar to intervertebral disc herniation. Symptoms, pain worsens after walking, rotating lower limbs or catching cold. Extended information

Principles of piriformis muscle

The piriformis muscle is a smaller muscle among the gluteal muscles. It is located in the middle of the gluteal region, is deeply located, and is on the same plane as the gluteus medius muscle. . It originates from the front of the sacrum through three muscle teeth, which are attached to the bone surface between the anterior sacral foramen and the groove extending from the anterior sacral foramen. It also originates from the hip surface of the ilium near the posterior inferior iliac spine and the adjacent sacroiliac The joint capsule and sometimes the pelvic surface of the sacrotuberous ligament arise.

The muscles pass out of the pelvis from the greater ischial foramen and generally fill the hole. This becomes an important reference point for the structures above and below it. The piriformis muscle inserts on the medial edge of the upper edge of the greater trochanter via the round tendon.

The tendon is located posterosuperiorly to the obturator internus and the common tendon of the tibia, and is often partially fused with them. The piriformis muscle can also fuse with the gluteus medius. The sciatic nerve runs under the piriformis muscle when passing through the greater sciatic foramen. When the sciatic nerve is injured, it can easily stimulate the surrounding piriformis muscle to produce inflammatory edema.

Baidu Encyclopedia-Piriformisitis