1. Prospective, Randomized, Multicenter Food and Drug Administration Investigational Device Exemption Study of the ProDisc-L Total Disc Replacement Compared with Circumferential Arthrodesis for the Treatment of Two-Level Lumbar Degenerative Disc Disease by Rick Delamarter, Jack E. Zigler, Richard A. Balderston, Frank P. Cammisa, Jeffrey A. Goldstein, and Jeffrey M. Spivak J Bone Joint Surg Am Volume 93(8):705-715 April 20, 2011 ©2011 by The Journal of Bone and Joint Surgery, Inc.

2. Flow diagram of the study design. Rick Delamarter et al. J Bone Joint Surg Am 2011;93:705- 715 ©2011 by The Journal of Bone and Joint Surgery, Inc.

3. Lateral radiographs of the lumbar spine of a thirty-eight-year-old man, made twenty-four months after treatment with the ProDisc-L total disc replacement at L3-L4 and L4-L5. Rick Delamarter et al. J Bone Joint Surg Am 2011;93:705- 715 ©2011 by The Journal of Bone and Joint Surgery, Inc.

4. Line graph showing the percentage of patients using narcotics for each surgical treatment over time. Rick Delamarter et al. J Bone Joint Surg Am 2011;93:705- 715 ©2011 by The Journal of Bone and Joint Surgery, Inc.