Table 2.
Age distribution (years) among the different groups
| Type of TKA | Number | Mean | Median | SD | Range |
|---|---|---|---|---|---|
| De novo TKA | 118,229 | 69.7 | 70.5 | 8.5 | 34–85 |
| TKA after closed wedge | 356 | 59.8 | 60.1 | 7.3 | 41–80 |
| TKA after open wedge | 482 | 59.1 | 59.5 | 7.5 | 34–85 |
| TKA after UKA | 920 | 66.2 | 65.3 | 8.6 | 44–85 |
UKA = unicompartmental knee arthroplasty.