Difference between sacroiliitis and synovitis

There are significant differences between sacroiliitis and synovitis in several aspects: 1. Affected areas: Sacroiliitis primarily affects the sacroiliac joints, which are the connections between the pelvis and spine; while synovitis commonly occurs in joints rich in synovium, such as the knee and hip joints. 2. Causes: Sacroiliitis is often associated with age, genetic factors, physical condition, especially primary sacroiliitis; whereas synovitis can be caused by various factors such as trauma, infection, and tuberculosis. 3. Symptoms: Sacroiliitis mainly presents with pain in the lower back and buttocks, morning stiffness, etc.; synovitis commonly presents with joint swelling, pain, limited movement, and other symptoms. 4. Treatment: Treatment for sacroiliitis includes medications and physical therapy; while treatment options for synovitis are more diverse, including medications and surgery.