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The intervertebral disc is removed and replaced with a small plug of bone or other graft substitute, along with a height restoration device to un-impinge nerves, and in time, the vertebrae will fuse together. Intervertebral disc arthroplasty: also called Artificial Disc Replacement (ADR), or Total Disc Replacement (TDR), is a type of arthroplasty.
Intervertebral discs may bulge or herniate into the canal or foraminal openings [26] Degenerative disc disease causes narrowing of the spaces. [27] Facet joints break down; Facet joints may hypertrophy [28] Compression fractures of the spine, which are common in osteoporosis [29]
Degenerative process of spondylosis such as disc bulging, osteophyte formation, and hypertrophy of the superior articular process all contributes to the narrowing of the spinal canal and intervertebral foramen, leading to compression of these spinal nerves that results in radiculopathy-related symptoms. [6]
The natural evolution of disc disease and degeneration leads to stiffening of the intervertebral joint. This leads to osteophyte formation—a bony overgrowth about the joint. This process is called spondylosis, and is part of the normal aging of the spine. This has been seen in studies of normal and diseased spines.
The condition is likely triggered by changes in the anulus fibrosus, the tough outer ring of the intervertebral disc. This disc degeneration causes osteophytes to grow in the area. The osteophytes develop bridges of connective tissue which become ossified, forming bone spurs. The pattern of osteophyte formation varies.
An intervertebral disc (British English), also spelled intervertebral disk (American English), lies between adjacent vertebrae in the vertebral column.Each disc forms a fibrocartilaginous joint (a symphysis), to allow slight movement of the vertebrae, to act as a ligament to hold the vertebrae together, and to function as a shock absorber for the spine.