sacroiliac joint dysfunction refers to problems in the sacroiliac joint, which connects the lower spine to the pelvis. This joint helps absorb shock and provides stability during movement. When it becomes inflamed or misaligned, it can lead to pain in the lower back, buttocks, and legs. Common causes of sacroiliac joint dysfunction include injury, arthritis, or pregnancy. Symptoms may worsen with certain activities, such as standing up, climbing stairs, or sitting for long periods. Treatment options often include physical therapy, pain management, and, in some cases, injections to reduce inflammation.