SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Slipped vertebra (anterolisthesis). Magnetic resonance imaging (MRI) scan showing anterolisthesis in a 52-year-old woman's back. Anterolisthesis is where a vertebra slips forward relative to the vertebrae beneath it. Here vertebra L4 (4th lumbar) has slipped forward on vertebra L5 below (lower centre), and the intervertebral disc between them has also collapsed. The slippage often occurs as a result of bone fractures and symptoms depend on the severity of the slippage. Treatment can include interbody fusion, a surgical procedure to place a bone graft between adjacent vertebrae.
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