Comparison of Single-Level and Multiple-Level Outcomes of Total Disc Arthroplasty: 24-Month Results.

Background: Low back pain is one of the most prevalent problems in industrialized countries, affecting as many as 80% of all adults at some time in their lives. Among the significant contributors to low back pain is degenerative disc disease (DDD). Although fusion has been well accepted for treatment of DDD, high rates of complications and stress to adjacent segments remain a concern.