Table 5 Time until revision for UKA and TKA

UKA Patients

UKA revisions

Avg. time between UKA and revision

#

%

p

RR

95% CI

Mean (SD)

Δ

95% CI

Total

7,808

303

3.88%

-

-

-

718.535 (SD 691.332)

-

-

Age at UKA

  < 70

3,180

166

5.22%

-

-

-

715.880 (SD 653.431)

-

-

 70–79

3,694

111

3.00%

 < 0.0001

0.5756

(0.4548, 0.7285)

742.694 (SD 755.353)

-26.814

(-59.798, 6.170)

  > 80

1,021

28

2.74%

 < 0.0001

0.5254

(0.3542, 0.7792)

656.179 (SD 589.094)

59.7

(10.7, 108.7)

Gender

 Female

4,216

173

4.10%

-

-

-

726.509 (SD 677.448)

-

-

 Male

3,592

130

3.62%

0.2695

0.882

(0.7056, 1.01024)

708.923 (SD 711.889)

17.586

(-13.4002, 48.5722)

TKA patients

TKA revisions

Avg. time between TKA and revision

#

%

p

RR

95% CI

Mean (SD)

Δ

95% CI

Total

150,680

3,921

2.60%

-

-

-

607.849 (SD 603.241)

-

-

Age at TKA

  < 70

61,030

2,177

3.57%

-

-

-

647.463 (SD 620.240)

-

-

 70–79

71,702

1,510

2.11%

 < 0.0001

0.5904

(0.5534, 0.6297)

604.472 (SD 613.365)

42.991

(36.345, 49.637)

  > 80

21,081

364

1.73%

 < 0.0001

0.4841

(0.4337, 0.5403)

555.085 (SD 610.039)

92.378

(82.738, 102.018)

Gender

 Female

96,536

2,448

2.54%

-

-

-

632.112 (SD 626.075)

-

-

 Male

54,144

1,473

2.72%

0.3007

1.0728

(1.0066, 1.1435)

576.525 (SD 561.138)

55.587

(49.4276, 61.7464)