Who is at risk for SI joint problems?

Women may be at increased risk for SI joint problems because of their broader pelvises and greater curvature of lumbar spine, which result in different SI joint biomechanics. Women also have more elastin in the collagen that makes up their ligaments. Elastin is a molecule that allows increased flexibility of ligaments. In addition, pregnancy often results in stretching of the sacroiliac ligaments. Some women have permanent changes to the SI joint ligaments as a result of pregnancy.