Copyright © 2012 American Medical Association. All rights reserved. From: Total Knee Arthroplasty Volume, Utilization, and Outcomes Among Medicare Beneficiaries, 1991-2010 JAMA. 2012;308(12):1227-1236. doi:10.1001/2012.jama.11153 Figure Legend: Y-axis shown in blue indicates range from 0 to 25 000 procedures per year. Date of download: 10/31/2017 Copyright © 2012 American Medical Association. All rights reserved.

Copyright © 2012 American Medical Association. All rights reserved. From: Total Knee Arthroplasty Volume, Utilization, and Outcomes Among Medicare Beneficiaries, 1991-2010 JAMA. 2012;308(12):1227-1236. doi:10.1001/2012.jama.11153 Figure Legend: Y-axis shown in blue indicates range from 0 to 7 procedures per year per 10 000 enrollees. The range of variability (1 SD) in primary total knee arthroplasty (TKA); procedures per 10 000 Medicare enrollees for 1991 was 31.0 to 31.4; for 2010, 5.0 to 5.1. For revision TKA, the range of variability (1 SD; procedures per 10 000 Medicare enrollees) for 1991 was 3.2 to 3.3; for 2010, 5.0 to 5.1. Date of download: 10/31/2017 Copyright © 2012 American Medical Association. All rights reserved.