Table 12 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

20,592

364

1.77%

-

-

-

932.942 (SD 768.273)

-

-

Age at UKA

  < 70

8,018

185

2.31%

-

-

-

862.746 (SD 755.779)

-

-

 70–79

9,433

140

1.48%

 < 0.0001

0.6432

(0.5175, 0.7995)

1039.486 (SD 778.513)

-176.74

(-199.296, -154.184)

  > 80

3,191

36

1.13%

 < 0.0001

0.4890

(0.3430, 0.6971)

789.528 (SD 697.079)

73.218

(42.137, 104.299)

Gender

 Female

10,543

224

2.12%

-

-

-

981.920 (SD 773.567)

-

-

 Male

9,933

135

1.36%

 < 0.0001

0.6397

(0.5176, 0.7906)

823.778 (SD 739.283)

158.142

(137.420, 178.864)

TKA patients

TKA revisions

Avg. time between TKA and revision

#

%

p

RR

95% CI

mean (SD)

Δ

95% CI

Total

110,562

3,630

3.28%

-

-

-

866.597 (SD 754.557)

-

-

Age at TKA

  < 70

41,518

1,865

4.49%

-

-

-

898.958 (SD 775.442)

-

-

 70–79

52,129

1,525

2.93%

 < 0.0001

0.6513

(0.6094, 0.6960)

908.423 (SD 772.142)

-9.4650

(-19.220, 0.290)

  > 80

19,632

368

1.87%

 < 0.0001

0.4173

(0.3736, 0.4660)

718.584 (SD 669.883)

180.3740

(167.529, 193.219)

Gender

 Female

71,394

2,279

3.19%

-

-

-

896.808 (SD 761.672)

-

-

 Male

38,214

1,211

3.17%

0.8352

0.9927

(0.9269, 1.0632)

814.272 (SD 743.505)

82.5360

(73.2201, 91.8519)