Vertebra L5

The fifth lumbar vertebra (L5; 5th lumbar vertebra) is characterized by a larger and broader vertebral body than other lumbar vertebrae, which tends to increase in breadth with age, often forming reinforcing columns of bone between the bases of the pedicles and osteophytes bordering the inferior endplate. The pedicles of L5 typically arise from the lateral surface of the body rather than posteriorly, as seen in other lumbar vertebrae.[1]

Quantitative three-dimensional studies have shown that L5, along with L4, serves as a transitional vertebra towards the sacral region, with specific linear, angular, and area dimensions that are crucial for clinical diagnosis and surgical management.[2] The vertebral body of L5 is noted to be shorter posteriorly and more lordotic, with longer lamina, isthmus, and vertebral canal compared to other lumbar vertebrae.[3]