"Spondylosis (plural: spondyloses) is used as a broad descriptive term referring to degeneration of the spinal column from any cause 1; it is usually further qualified by the part of the spine affected, e.g. cervical spondylosis and lumbar spondylosis 1."
"Further disc desiccation results in disc herniation through the posterior annular tear. The bulging disc causes the posterior longitudinal ligament to peel off from the surface of the vertebral body 1. Disc herniation irritates the posterior adjoining ends of the vertebrae, causing the new bone formation, known as an osteophyte. As osteophyte formation increases, it causes the narrowing of spinal canal, compressing the spinal cord, resulting in a condition known as "hyperostotic myelopathy". Osteophytes of the adjacent vertebrae may fuse, slowing the pathologic process and provides stability for the spine. However, the "awkward" kyphotic position of the spine gives rise to more stress of the other vertebral levels, resulting in progression of spondylosis to other vertebrae. Uncovertebral joint (that relates laterally to the disc) will also be affected, especially at C5/C6 and C6/C7 levels (most spine movements occur here). Other changes includes facet joint (located between lamina and pedicle) and ligamentum flavum hypertrophy (located on the lamina itself) that also contributes to canal narrowing 1."