Table 1.
Patient demographics
| TKA | UKA | |||
|---|---|---|---|---|
| Patient and implant factors | 1994–2004 | 2005–2015 | 1994–2004 | 2005–2015 |
| Number of cases | 17,404 | 43,219 | 2297 | 5351 |
| Number of revisions | 787 | 1639 | 190 | 535 |
| Mean age of patients at primary operation (years) | 70.5 | 68.7 | 65.6 | 64.5 |
| 95% CI | 70–71 | 69–69 | 65–66 | 64–65 |
| Range | 10–93 | 13–101 | 25–91 | 29–93 |
| Men, % | 28 | 37 | 38 | 48 |
| Prosthesis type, n (%) | ||||
| Total with patella | 3384 (19) | 1213 (3) | NA | NA |
| Total without patella | 14,020 (81) | 42,006 (97) | NA | NA |
| Diagnosis, number (%) | ||||
| Osteoarthritis | 13,987 (80) | 38,304 (89) | 2035 (87) | 5027 (94) |
| Rheumatoid arthritis | 1769 (10) | 1590 (4) | 5 (0) | 9 (0) |
| Other | 1589 (9) | 3255 (7) | 246 (11) | 303 (6) |
| Missing | 59 (0) | 70 (0) | 11 (1) | 12 (0) |
| Fixation method, number (%) | ||||
| Cemented | 15,101 (87) | 34,231 (79) | 2263 (99) | 5241 (98) |
| Uncemented | 281 (2) | 3012 (7) | 0 (0) | 66 (1) |
| Hybrid(conventional) | 1959 (11) | 5777 (13) | 9 (0) | 8 (0) |
| Missing | 63 (0) | 199 (1) | 25 (1) | 36 (1) |
| Prosthesis design, number (%) | ||||
| Mobile-bearing (cruciate retaining and posterior stabilizing) | 4478 (26) | 14,555 (34) | NA | NA |
| Cruciate-retaining | 12,694 (73) | 27,785 (64) | NA | NA |
| Posterior cruciate-stabilizing | 74 (0) | 638 (2) | NA | NA |
| Constrained condylar knee | 15 (0) | 113 (0) | NA | NA |
| Missing | 143 (1) | 128 (0) | NA | NA |
UKA = unicompartmental knee arthroplasty; NA = not applicable.