Lumbosacral symphysis

The lumbosacral joint is a joint between the last lumbar vertebra and the first sacral segment of the vertebral column.[

The ligaments connecting the fifth lumbar vertebra with the sacrum are similar to those which join the movable segments of the vertebral column with each other—viz.:

• 1. The continuation downward of the anterior and posterior longitudinal ligaments.

• 2. The intervertebral fibrocartilage, connecting the body of the fifth lumbar to that of the first sacral vertebra and forming an amphiarthrodial joint.

• 3. Ligamenta flava, uniting the laminæ of the fifth lumbar vertebra with those of the first sacral.

• 4. Capsules connecting the articular processes and forming a double arthrodia.

• 5. Inter- and supraspinal ligaments.

On either side an additional ligament, the iliolumbar, connects the pelvis with the vertebral column.