TABLE I.
Distribution of Posterior-Stabilized Prostheses by Registry, Mobility, Age, Sex, Fixation Method, and Patellar-Resurfacing Status*
| U.S. (KP) | Australia | Italy (E-R) | Sweden | Norway | Spain (C) | |
| Fixed-bearing PS | ||||||
| Age in yr | ||||||
| <45 | 203 (0.6) | 281 (0.5) | 13 (0.2) | 13 (0.2) | 7 (0.9) | 4 (0) |
| 45 to 55 | 3047 (8.4) | 3631 (6.9) | 136 (1.6) | 333 (6.3) | 45 (5.8) | 69 (0.7) |
| 56 to 65 | 10,768 (29.8) | 14,354 (27.4) | 1161 (13.8) | 1282 (24.2) | 169 (21.8) | 835 (8.1) |
| >65 | 22,149 (61.2) | 34,141 (65.1) | 7095 (84.4) | 3664 (69.2) | 553 (71.4) | 9384 (91.2) |
| Sex | ||||||
| Male | 13,327 (36.8) | 22,228 (42.4) | 2148 (25.6) | 1973 (37.3) | 201 (26.0) | 2969 (28.8) |
| Female | 22,840 (63.2) | 30,179 (57.6) | 6257 (74.4) | 3319 (62.7) | 573 (74.0) | 7323 (71.2) |
| Fixation | ||||||
| Cementless | 926 (2.6) | 2970 (5.7) | 132 (1.6) | 25 (0.5) | 15 (1.9) | 222 (2.2) |
| Hybrid | 774 (2.1) | 2960 (5.6) | 64 (0.8) | 3 (0.1) | 266 (34.4) | 1253 (12.2) |
| Cemented | 34,467 (95.3) | 46,477 (88.7) | 8209 (97.7) | 5264 (99.5) | 493 (63.7) | 8817 (85.7) |
| Resurfacing | ||||||
| No | 218 (0.6) | 21,357 (40.8) | 6246 (74.3) | 3310 (62.5) | 746 (96.4) | 5184 (50.4) |
| Yes | 35,949 (99.4) | 31,050 (59.2) | 2159 (25.7) | 1982 (37.5) | 28 (3.6) | 5108 (49.6) |
| Mobile-bearing PS | ||||||
| Age in yr | ||||||
| <45 | 51 (1.1) | 101 (0.8) | 6 (0.1) | 7 (1.4) | 0 (0) | 1 (0.9) |
| 45 to 55 | 714 (15.4) | 1033 (7.7) | 84 (1.5) | 58 (12.0) | 0 (0) | 5 (4.6) |
| 56 to 65 | 1955 (42.1) | 3860 (28.9) | 746 (13.1) | 177 (36.6) | 0 (0) | 15 (13.8) |
| >65 | 1929 (41.5) | 8358 (62.6) | 4850 (85.3) | 241 (49.9) | 0 (0) | 88 (80.7) |
| Sex | ||||||
| Male | 1880 (40.4) | 5968 (44.7) | 1477 (26.0) | 220 (45.5) | 0 (0) | 38 (34.9) |
| Female | 2769 (59.6) | 7384 (55.3) | 4209 (74.0) | 263 (54.5) | 0 (0) | 71 (65.1) |
| Fixation | ||||||
| Cementless | 39 (0.8) | 773 (5.8) | 397 (7.0) | 0 (0) | 0 (0) | 32 (29.4) |
| Hybrid | 41 (0.9) | 1768 (13.2) | 101 (1.8) | 0 (0) | 0 (0) | 3 (2.8) |
| Cemented | 4569 (98.3) | 10,811 (81.0) | 5188 (91.2) | 483 (100) | 0 (0) | 74 (67.9) |
| Resurfacing | ||||||
| No | 48 (1.0) | 5412 (40.5) | 4552 (80.1) | 296 (61.3) | 0 (0) | 38 (34.9) |
| Yes | 4601 (99.0) | 7940 (59.5) | 1134 (19.9) | 187 (38.7) | 0 (0) | 71 (65.1) |
*
The values are given as the number of each, with the percentage in parentheses. KP = Kaiser Permanente, E-R = Emilia-Romagna region, C = Catalan region, and PS = posterior-stabilized prostheses.