In Wisconsin artificial disc replacement (ADR) is a rare option for injured workers with workers compensation claims. ADR is a device or implant used to replace a diseased or damaged intervertebral disc. After removing what’s left of the worn out disc, the ADR is inserted in the space between two lumbar vertebrae. The goal is to replace the diseased or damaged disc while keeping your normal spinal motion. Artificial disc surgery is relatively new in the United States but has been used in Europe for many years. In the U.S., the first lumbar artificial disc replacement surgery was done in clinical trials in October 2001. The Federal Drug Administration (FDA) approved the use of the lumbar ADRs in October 2004.
The human spine is made up of 24 spinal bones called vertebrae. Vertebrae are stacked on top of one another to form the spinal column. The spinal column gives the body its form. It is the body’s main upright support. The section of the spine in the lower back is known as the lumbar spine. Lumbar artificial disc replacement typically occurs in the lumbar spine (from L4-S1).
An intervertebral disc sits between each pair of vertebrae. The disc normally works like a shock absorber. It protects the spine against the daily pull of gravity. It also protects the spine during strenuous activities that put strong force on the spine, such as jumping, running, and lifting.
An intervertebral disc is made of two parts. The center, called the nucleus is spongy. It provides most of the disc’s ability to absorb shock. The nucleus is held in place by the annulus, a series of strong ligament rings surrounding it. Ligaments are connective tissues that attach bones to other bones.
Between the vertebrae of each spinal segment are two facet joints. The facet joints are located on the back of the spinal column. There are two facet joints between each pair of vertebrae, one on each side of the spine. A facet joint is made of small, bony knobs that line up along the back of the spine. Where these knobs meet, they form a joint that connects the two vertebrae. The alignment of the facet joints of the lumbar spine allows freedom of movement as you bend forward and back.
From the side, the spine forms three curves. The neck, called the cervical spine, curves slightly inward. The middle back, or thoracic spine, curves outward. The outward curve of the thoracic spine is called kyphosis. The low back, also called the lumbar spine, curves slightly inward. An inward curve of the spine is called lordosis.
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