Lumbar spinal arthroplasty: analysis of one center's twenty best and twenty worst clinical outcomes.

Study Design: This is a retrospective analysis of data that were collected prospectively from 2 concurrent FDA IDE lumbar arthroplasty clinical trials performed at a single center.

Objectives: The purpose of this study was to determine if factors differentiating those patients with the best and worst clinical outcomes from total disc arthroplasty (TDR) could be identified.

Summary Of Background Data: Overall the results of TDR have been favorable, including recent results from 2 FDA IDE trials conducted in the United States.