Table 1.
Demographics of patients in 2019 and 2020.
| Type of operation | Gender | 2019 | 2020 | ||||
|---|---|---|---|---|---|---|---|
| N° | % | Age at operation (±SD) | N° | % | Age at operation (±SD) | ||
| Primary THR | Male | 1610 | 46% | 66.64 (±10.26) | 1269 | 45% | 66.14 (±10.87) |
| Female | 1920 | 54% | 69.18 (±10.24) | 1523 | 55% | 69.71 (±10.50) | |
| Primary Total and Partial KR | Male | 1157 | 36% | 67.80 (±8.54) | 929 | 38% | 67.97 (±8.84) |
| Female | 2034 | 64% | 70.12 (±8.38) | 1494 | 62% | 70.19 (±8.67) | |
| Revision HR | Male | 168 | 48% | 69.28 (±11.13) | 123 | 39% | 69.84 (±11.99) |
| Female | 184 | 52% | 73.99 (±9.23) | 194 | 61% | 75.03 (±10.52) | |
| Revision KR | Male | 84 | 39% | 68.13 (±9.74) | 65 | 41% | 68.40 (±7.84) |
| Female | 129 | 61% | 69.83 (±10.01) | 94 | 59% | 71.53 (±8.80) | |
| Sum of THR and KR | Male | 3019 | 41% | 67.96 (±9.92) | 2386 | 42% | 68.09 (±9.89) |
| Female | 4267 | 59% | 70.78 (±9.47) | 3305 | 58% | 71.62 (±9.62) |
Figure 1.
Comparison of surgery volumes of THR in 2019 and 2020 per month.
Figure 2.
Simple Error Bar comparing 95% CI of two medians of THR per month in 2019 and 2020.
Figure 3.
Comparison of surgery volumes of KR in 2019 and 2020 per month.
Figure 4.
Simple Error Bar comparing 95% CI of two medians of KR per month in 2019 and 2020.
Table 2.
Reasons for revision for hip and knee replacements.
| N° | N° | p-value | N° | N° | p-value | |
|---|---|---|---|---|---|---|
| 2-stage revision | 20 | 22 | 0.503 | 22 | 21 | 0.390 |
| Aseptic loosening | 117 | 99 | 0.579 | 34 | 32 | 0.298 |
| Deep infection | 42 | 48 | 0.224 | 82 | 50 | 0.160 |
| Dislocation | 37 | 21 | 0.074 | 0 | 0 | NA |
| Broken Implant | 12 | 9 | 0.673 | 0 | 0 | NA |
| Malalignment | 0 | 0 | NA | 21 | 21 | 0.313 |
| Other | 41 | 28 | 0.232 | 29 | 19 | 0.636 |
| Pain | 10 | 27 | 0.001 | 20 | 6 | 0.036 |
| Periprosthetic fracture | 73 | 63 | 0.781 | 5 | 10 | 0.056 |
| Chi-square test | x2df(7) p=0.025 | x2df(6) p=0.073 | ||||
Table 3.
90-day mortality after primary and revision HR and KR.
| Type of operation | 2019 | 2020 | x2df(1) | ||||
|---|---|---|---|---|---|---|---|
| N° of operations | N° of deaths in 90-days | % of deaths | N° of operations | N° of deaths in 90-days | % of deaths | p-value | |
| Primary THR | 3691 | 15 | 0.4 | 3436 | 14 | 0.4 | 0.994 |
| Primary Total and Partial KR | 3191 | 4 | 0.1 | 2423 | 8 | 0.3 | 0.100 |
| Revision HR | 352 | 11 | 3.1 | 317 | 14 | 4.4 | 0.379 |
| Revision KR | 213 | 5 | 2.4 | 159 | 2 | 1.3 | 0.444 |
| x2df(3) | p=0.408 |