Table 2 Patient characteristics and outcomes after total knee revision(2010–2019)

Total (n = count)

14,899

100,173

Total incidence (%)

13.0

Age (mean, SD)

67.4 (11.4)

64.7(10.7)

< 0.001

Age group (%)

 ≤ 50

1003 (6.7%)

8985 (9.0%)

< 0.001

 51–60

2963 (19.9%)

25,593(25.5%)

 61–70

40,149 (32.0%)

35,378 (35.3%)

 ≥ 71

6162 (41.4%)

30.2 (30.2%)

Gender (%)

 Male

5348 (35.9%)

42,848 (42.8%)

< 0.001

 Female

9553 (64.1%)

57,323 (57.2%)

Race (%)

 White

10,549 (70.8%)

75,117 (75.0%)

< 0.001

 Black

2084 (14.0%)

10,343 (10.3%)

 Hispanic

970 (6.5%)

5071 (5.1%)

 Asian or Pacific Islander

133 (0.9%)

722 (0.7%)

 Native American

81 (0.5%)

536 (0.5%)

 Other

1082 (7.3%)

8384 (8.4%)

Elixhauser score

 0

776 (5.2%)

11,834 (11.8%)

< 0.001

 1

1932 (13.0%)

22,310 (22.3%)

 ≥ 2

12,191 (81.8%)

66,029(65.9%)

LOS (mean, SD)

6.9 (6.8)

3.8 (4.1)

< 0.001

TOTCHG (mean,$)

121,039.0

(131905.6)

86,308.5

(72784.4)

< 0.001

Type of insure (%)

 Medicare

10,038 (67.4%)

56,571 (56.5%)

< 0.001

 Medicaid

833 (5.6%)

5303(5.3%)

 Private insurance

3459 (23.2%)

32,303(32.2%)

 Self-pay

80 (0.5%)

570 (0.6%)

 No charge

12 (0.1%)

63 (0.1%)

 Other

477 (3.2%)

5363 (5.4%)

Bed size of hospital (%)

 Small

2987 (20.0%)

23,759 (23.7%)

< 0.001

 Medium

4097 (27.5%)

27,046 (27.0%)

 Large

7815 (52.5%)

49,368 (49.3%)

Elective admission (%)

10,382 (69.7%)

83,523 (83.4%)

< 0.001

Type of hospital (teaching, %)

8686 (58.3%)

61,887 (61.8%)

< 0.001

Location of hospital (urban, %)

13,565 (91.0%)

92,648 (92.5%)

< 0.001

Region of hospital (%)

 Northeast

3084 (20.7%)

17,078 (17.0%)

< 0.001

 Midwest or North Central

3096 (20.8%)

26,541 (26.5%)

 South

6175 (41.4%)

37,210 (37.1%)

 West

2544 (17.1%)

19,344 (19.3%)

Died (%)

115 (0.8%)

194 (0.2%)

< 0.001