Table 1 Baseline data of patients with knee arthroplasty from 2011 to 2020
Variables | Number of patients (23,610) |
|---|---|
Sex | |
Male, n (%) | 5400 (22.9) |
Female, n (%) | 18,210 (77.1) |
Age (years, mean ± SD) | 65.7 ± 7.6 |
≤ 19, n (%) | 2 (0.0) |
20–29, n (%) | 16 (0.1) |
30–39, n (%) | 32 (0.1) |
40–49, n (%) | 563 (2.4) |
50–59, n (%) | 5060 (21.4) |
70–79, n (%) | 6274 (26.6) |
80–89, n (%) | 676 (2.9) |
≥ 90, n (%) | 7 (0.0) |
BMI (kg/m2, mean ± SD) | 26.4 ± 3.8 |
≤ 18.5, n (%) | 245 (1.0) |
18.5–23.9, n (%) | 5795 (24.6) |
24–27.9, n (%) | 9936 (42.1) |
≥ 28, n (%) | 7634 (32.3) |
Kellgren–Lawrence classification | |
Grade III | 1482 (6.3) |
Grade IV | 22,128 (93.7) |
Surgical side | |
Left, n (%) | 11,269 (47.7) |
Right, n (%) | 12,341 (52.3) |
Surgical strategies | |
TKA, n (%) | 22,288 (94.4) |
UKA, n (%) | 1321 (5.6) |
Comorbidities | |
0, n (%) | 7207 (30.5) |
1, n (%) | 8185 (34.7) |
2, n (%) | 4586 (19.4) |
≥ 3, n (%) | 3632 (15.4) |
Hospital stay (days) | |
TKA (median, interquartile range) | 11 (8) |
UKA (median, interquartile range) | 9 (6) |
Hospitalization costs ($) | |
TKA (median, interquartile range) | 8393.9 (2,460.0) |
UKA (median, interquartile range) | 7319.4 (2,662.6) |