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Compression fractures of the spine usually occur at the bottom part of the thoracic spine (T11 and T12) and the first vertebra of the lumbar spine (L1).Compression fractures of the spine generally occur from too much pressure on the vertebral body.ompression fractures of the spine usually occur at the bottom part of the thoracic spine (T11 and T12) and the first vertebra of the lumbar spine (L1).
The most common causes of pain that originate in the lumbosacral segment L5-S1 include: 1  L5-S1 disc herniation: The disc becomes herniated when the inner portion leaks out and touches the nearby nerve root, causing pain to radiate in the lower back and/or down the leg.2  Read Lumbar Herniated Disc. L5-S1 degenerative disc disease: If the L5-S1 disc is compromised, the L5-S1 disc itself can become a source of lower back and/or leg pain.