Lumbar ligamentum flavum hypertrophy is due to accumulation of inflammation-related scar tissue.

Study Design: A histologic, biologic, and immunohistochemical assessment using human samples of the lumbar ligamentum flavum.

Objective: To prove our hypothesis that hypertrophy of the ligamentum flavum is caused by accumulation of inflammation-related scar tissue.

Summary Of Background Data: Lumbar spinal canal stenosis is 1 of the most common spinal disorders in elderly patients.