Structure: The SI joint is a synovial joint, meaning it has a small amount of fluid within it that allows for limited motion. However, it’s not a highly mobile joint. Its primary function is to transfer forces from the upper body to the lower body and vice versa. The joint is reinforced by strong ligaments that limit its movement, allowing it to provide stability rather than a wide ra... https://ashokainternationalpainmanagementcentre.com/joint-pain/