The sacroiliac joint, also known as the SI joint, connects the bottom of your spinal cord with the pelvis. It is located in the lower back. This joint allows us to twist our torso while moving our legs. The SI joint acts as a shock absorber for your body, which means it undergoes a lot of pressure. When we have pain in this area, it is known as sacroiliac joint discomfort. It is also often called SI joint pain or sacroiliac joint dysfunction.
The most common symptom of an SI joint injury is pain in the lower back and hips. This pain may also be felt in the groin, buttocks, and thighs. It can range from a dull ache to a sharp pain. The pain may also get worse while standing and moving around. It may also improve when lying down because there is less pressure on the SI joint. Some patients also experience stiffness and tenderness.