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Lower limb joints - Pelvic girdle

This is a large, strong syndesmotic junction between the sacrum and ilium. It connects the two bones posterior and inferior to the sacroiliac joint between ill-fitting rough surfaces posterior to the cartilage covered auricular surfaces on both the sacrum and the ilium. It consists of deep and superficial bands that cross between the bones in a variety of orientations to strongly bind the adjacent surfaces.

Probably the strongest sacroiliac junction. Stabilizes the sacroiliac joint and limits movement.

Ligamentum sacroiliacum interosseum

Ligaments sacroiliaques interosseux