combustion. n. 1. the process of burning. 2. (Chemistry) any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light. 3. (Chemistry) a chemical process in which two compounds, such as sodium and chlorine, react together to produce heat and light.
Facet joint syndrome is an arthritis-like condition of the spine that can be a significant source of back and neck pain. It is caused by degenerative changes to the joints between the spine bones. The cartilage inside the facet joint can break down and become inflamed, triggering pain signals in nearby nerve endings.
Located on the bony extensions of the vertebrae, the surfaces of the facet joints fit together like a three-dimensional puzzle. In the spaces between vertebrae run the nerve rootsâexits off the spinal cord's information highway.