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Table 9 Elixhauser and Charlson comorbidity adjustment scores for UKA and TKA

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

Adjustment score Elixhauser Charlson
UKA TKA UKA TKA
Number of patients with the Elixhauser/Charlson score
0 729 504 8,358 25,981
1 1,749 1,861 5,177 24,946
2 2,418 3,580 3,071 19,094
3 2,493 5,510 1,698 14,143
4 2,287 6,914 893 8,922
5 2,017 8,016 516 5,860
6 1,673 8,509 301 3,663
7 1,452 8,747 190 2,381
8 1,222 8,624 138 1,723
9 935 8,415 87 1,267
10 842 7,992 69 904
11 636 7,470 42 611
12 533 6,589 22 353
13 422 5,946 12 268
14 348 5,172 - 169
15 262 4,259 - 126
16 185 3,440 - 56
17 139 2,904 - 37
18 100 2,197 - 27
19 74 1,565 - 12
20 26 1,007 - -
21 24 643 - -
22 15 356 - -
23 - 199 - -
24 - 84 - -
25 - 37 - -
26 - 16 - -
  Overall
Average 5.73 9.30 1.43 2.39
Median 5.00 9.00 1.00 2.00
St. dev 4.11 4.71 1.91 2.54
p  < 0.0001  < 0.0001