Paper 46: Long-Term Durability of Functional Improvement After Treatment with Autologous Chondrocyte Implantation (ACI): a Multicenter, Observational Study in US Subjects - Moseley, Bruce, MD, USA; Anderson, Allen F., MD, USA; Browne, Jon E., MD, USA; Mandelbaum, Bert R., MD, USA; Micheli, Lyle J., MD, USA; Fu, Freddie H., MD, USA; Erggelet, Christoph, MD PhD, Germany (Arthroscopy, 2012)