Sacroiliac (SI) joint dysfunction and piriformis syndrome are two distinct but closely linked conditions that often coexist because the piriformis muscle directly crosses and stabilizes the SI joint. This anatomical proximity frequently creates a "vicious cycle" where dysfunction in one triggers or worsens the other. The Anatomical Connection
Sciatica and SI Joint Dysfunction: The Surprising Connection
: Connects the spine to the pelvis and acts as a shock absorber for the upper body.