What is subtle retrolisthesis of L1 on L2?

Subtle retrolisthesis of L1 on L2 refers to a slight backward displacement of the first lumbar vertebra (L1) relative to the second lumbar vertebra (L2). This condition can occur due to various factors, including degenerative changes, trauma, or abnormalities in the spine's alignment. While it may not always cause symptoms, it can sometimes lead to pain or discomfort in the lower back. Diagnosis typically involves imaging studies such as X-rays or MRI.