Piriformis Syndrome

Piriformis syndrome, as traditionally understood, involves irritation of the sciatic nerve by the piriformis muscle deep in the buttock. However, this represents an outdated understanding of buttock and leg pain. For decades, "Piriformis Syndrome" was used as a catch-all term for buttock pain with leg symptoms. While the piriformis muscle can be involved, we now understand the situation is more complex.

The more accurate and comprehensive term is "Deep Gluteal Syndrome" (DGS). This describes the entrapment or irritation of the sciatic nerve not just by the piriformis, but by a number of other structures in the deep buttock space, such as fibrous bands, the gemelli-obturator internus muscle group, or other anatomical variations. The deep gluteal space is a busy anatomical neighborhood where the sciatic nerve must navigate a narrow tunnel surrounded by several deep hip rotator muscles.

This diagnostic evolution is important because treatment approaches differ significantly. Rather than focusing solely on the piriformis muscle, effective management requires a comprehensive assessment of the entire deep gluteal space, movement patterns, and the function of all the muscles that could contribute to nerve compression. The concept of piriformis syndrome as an isolated condition is being replaced by the broader, more accurate understanding of Deep Gluteal Syndrome.