Cervical Total Disc Replacement: Indications and Technique Cervical Total Disc Replacement: Food and Drug Administration-Approved Devices Cervical Total Disc Replacement: Expanded Indications Cervical Total Disc Replacement: Novel Devices Cervical Total Disc Replacement: Long-Term Outcomes Cervical Total Disc Replacement: Complications and Complication Avoidance Cervical Spine Surgery: Arthroplasty Versus Fusion Versus Posterior Foraminotomy Biomechanics of Cervical Disc Arthroplasty Devices Adjacent-Segment Disease Following Spinal Arthroplasty Lumbar Total Disc Replacement: Current Usage Posterior Lumbar Facet Replacement and Arthroplasty