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Table 9 Comparison of quality indicators between hospitals with a caseload ≥50 vs. < 50 of total knee arthroplasty (TKA) per year

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

   2010 2012 2013 2014
TKA Quality Indicator Hospital case load Hospital n Mean rank Hospital n Mean rank Hospital n Mean rank Hospital n Mean rank
TKA meeting indication criteria < 50 cases 94 542.3 195 549.6 251 516.8 241 539.1
≥50 cases 823 449.5 762 460.9 723 477.3 749 481.5
p   0.001   < 0.001   0.052   0.005
Perioperative antibiotic-prophylaxis applied < 50 cases    198 548.2 251 557.0 244 560.0
≥50 cases    764 464.2 724 464.1 751 477.9
p     < 0.001   < 0.001   < 0.001
Postoperative mobility (neutral zero method) measured < 50 cases 92 516.6 194 570.2 251 587.8 240 545.1
≥50 cases 823 451.5 763 455.8 723 452.7 750 479.6
p   0.016   < 0.001   < 0.001   0.001
Postoperative mobility of at least 0/0/90 (neutral zero method) < 50 cases 91 435.7 194 493.6 245 483.1 233 504.2
≥50 cases 820 458.3 761 474.0 724 485.7 749 487.6
p   0.438   0.377   0.899   0.434