Spondylolisthesis is a condition where one vertebra slips forward relative to the one beneath it, most commonly in the lower lumbar spine.
Lower back pain, sometimes with leg pain or numbness, that may worsen with standing, walking, or back extension; in severe slips, weakness or changes in bladder or bowel function.
Imaging shows which level has slipped, how much, whether nerve roots are being compressed, and whether a pars defect or arthritis is the underlying cause.
Standing X-rays show the slip; MRI shows nerve involvement; CT clarifies the bony anatomy when surgery is being planned.
Treatment may include physiotherapy, pain management, activity modification, and surgical stabilisation for severe slips or significant nerve compression.
This entry explains the finding. The next step is having a radiologist interpret your specific scan, not a general definition.