Table 4 Number of total knee arthroplasty (TKA) cases and hospitals performing TKA per year in the study population compared to data from the external hospital quality assurance programme (eQA) [22]

From: Impact of suspending minimum volume requirements for knee arthroplasty on hospitals in Germany: an uncontrolled before–after study

  Cases: study population Cases: eQA Cases:
difference between data sets
% Cases: difference between data sets Hospitals: study population Hospitals: eQA Hospitals: difference between data sets % Hospitals: difference between data sets
2004   110,349     1016   
2005   118,967     1054   
2006 120,700 125,394 4694 3.7 888 1005 117 11.6
2007   136,379     999   
2008 141,714 146,318 4604 3.1 926 1017 91 8.9
2009   148,298     1022   
2010 140,866 146,747 5881 4.0 956 1036 80 7.7
2011   145,750     1030   
2012 127,404 133,948 6544 4.9 987 1033 46 4.5
2013 121,134 127,192 6058 4.8 1007 1031 24 2.3
2014 124,544 130,804 6260 4.8 1017 1160 143 12.3
2015   134,224     1153   
2016   146,615     1137   
2017   148,160     1100