RT Journal Article SR Electronic T1 Surgeon Volume and Differences in Rates of Primary Total Knee Arthroplasty Across 3 US States JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP jrheum.220734 DO 10.3899/jrheum.220734 A1 Michael M. Ward YR 2022 UL http://www.jrheum.org/content/early/2022/11/25/jrheum.220734.abstract AB Rates of total knee arthroplasty (TKA), one of the most common surgical procedures, vary markedly across regions, even after accounting for knee arthritis prevalence.1,2 In the United States, TKA rates are generally higher in the Midwest and Mountain West, and lower in the Southeast and on both coasts.2