iliolumbar ligament

The iliolumbar ligament is a strong band of connective tissue which courses from the transverse process of L5 (in over 96% of cases) to the posterior iliac wing and crest of the ilium. It functions to maintain the alignment of L5 on the sacrum during various movements .

It is an important landmark in correct labeling of vertebral levels in patients with lumbosacral transitional vertebrae (LSTV) .

Related pathology 

  • ossification of iliolumbar ligaments: can be associated with seronegative spondyloarthropathies 
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