1. The Current State of Cervical and Lumbar Spinal Disc Arthroplasty by R. Douglas Orr, Paul D. Postak, Mircea Rosca, and A. Seth Greenwald J Bone Joint Surg Am Volume 89(suppl 3):70-75 October 1, 2007 ©2007 by The Journal of Bone and Joint Surgery, Inc.

2. Spinal device sales in the United States. R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.

3. Treatment algorithm for lumbar spine abnormalities. R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.

4. Treatment algorithm for cervical spine abnormalities. R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.

5. Charité lumbar disc replacement (DePuy Spine, Raynham, Massachusetts). R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.

6. ProDisc-L lumbar disc replacement (Synthes, Paoli, Pennsylvania). R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.

7. Prestige ST cervical disc replacement (Medtronic, Memphis, Tennessee). R. Douglas Orr et al. J Bone Joint Surg Am 2007;89:70-75 ©2007 by The Journal of Bone and Joint Surgery, Inc.