Hip and Knee Arthroplasty - Surface Hippy Guide to Hip Resurfacing

Table KT18:
Primary Total Knee Replacement requiring Revision by Patella Usage
Patella Usage
Number
Revised
Total Number
Observed
Component
Years
Revisions per
100 Observed
Component
Years
Exact 95%
CI
No Patella used 2618 93796 284438 0.9 (0.89, 0.96)
Patella used 1469 70968 211074 0.7 (0.66, 0.73)
Total 4087 164764 495511 0.8 (0.80, 0.85)
Figure KT13:
Cumulative Percent Revision of Primary Total Knee Replacement
by Patella Usage
Number at Risk 0 Yr 1 Yr 2 Yrs 3 Yrs 4 Yrs 5 Yrs 6 Yrs 7 Yrs
No Patella used 93796 76130 59102 43301 30151 18590 8754 2514
Patella used 70968 56668 44132 32836 22502 13448 5756 1199
Table KT19:
Yearly Cumulative Percent Revision of Primary Total Knee Replacement
by Patella Usage
CPR 1 Yr 2 Yrs 3 Yrs 5 Yrs 7 Yrs
No Patella used 1.2 (1.1, 1.2) 2.4 (2.3, 2.5) 3.1 (3.0, 3.3) 4.0 (3.9, 4.2) 4.7 (4.4, 4.9)
Patella used 0.9 (0.8, 1.0) 1.7 (1.6, 1.8) 2.3 (2.2, 2.4) 3.1 (2.9, 3.3) 3.8 (3.5, 4.1)
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