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Table 5 Time until revision for UKA and TKA

From: Unicompartmental knee arthroplasty: A PearlDiver study evaluating complications rates, opioid use and utilization in the Medicare population

  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)