Abstract
A lthough fusion has been the standard surgical treatment for degenerative spine disease, there are inevitable drawbacks of spinal fusion (e.g., loss of segmental motion, pseudarthrosis, and adjacent-segment degeneration). There are reports of adjacent-segment disease after anterior cervical discectomy and fusion (ACDF) and lumbar fusion, but the actual incidence of adjacent-segment disease remains uncertain (6, 9, 10). The longterm clinical outcomes of spinal arthroplasty and the true effect on adjacent segments are still under investigation. There are several prospective, randomized, controlled clinical trials by the United States Food and Drug Administration (FDA) comparing cervical arthroplasty with ACDF and lumbar arthroplasty to lumbar fusion that provide 2 to 5 years of data (2, 3, 7, 8, 13, 15).
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