Patients with Degenerative Disc Degeneration who developed symptoms over time have few therapeutic choices other than conservative care or level fusion for a very long time. The purpose of lumbar fusion is to restore stability and stop motion at deteriorated joints. In the USA, Lumbar Disc Replacement Device therapy for lumbar DDD increased 2.4-fold between 2000 and 2009. Even though fusion surgeries are more common, there are still a number of possible problems with them, including difficulties at the bone donation site, adjacent segment degeneration (ASD), and inability to establish a solid fusion mass (pseudarthrosis) (usually the iliac crest). Increased biomechanical load and/or the natural course of lumbar spondylosis may provide radiographic evidence of degeneration of disc spaces close to the site of a lumbar fusion.
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