TABLE II.
Included Implants According to Registry, Bearing Surface, Head Size, Age, and Sex
| Registry*
(no. [%]) |
||||||
| U.S., KP | Australia | Italy, E-R | U.S., HE | Norway | Spain, C | |
| Ceramic-on-ceramic | ||||||
| Head size, >28 mm | ||||||
| Age, 45-54 yr | 109 (38.2) | 3772 (28.9) | 443 (19.8) | 56 (49.6) | 143 (21.6) | 31 (25.2) |
| Age, 55-64 yr | 176 (61.8) | 9278 (71.1) | 1796 (80.2) | 57 (50.4) | 520 (78.4) | 92 (74.8) |
| Male | 142 (49.8) | 6744 (51.7) | 1072 (47.9) | 70 (61.9) | 268 (40.4) | 81 (65.9) |
| Female | 143 (50.2) | 6306 (48.3) | 1167 (52.1) | 43 (38.1) | 395 (59.6) | 42 (34.1) |
| Head size, ≤28 mm | ||||||
| Age, 45-54 yr | 8 (53.3) | 873 (33.1) | 256 (23.2) | 4 (36.4) | 88 (28.9) | 22 (34.9) |
| Age, 55-64 yr | 7 (46.7) | 1768 (66.9) | 849 (76.8) | 7 (63.6) | 217 (71.1) | 41 (65.1) |
| Male | 0 (0) | 838 (31.7) | 463 (41.9) | 0 (0.0) | 95 (31.1) | 27 (42.9) |
| Female | 15 (100) | 1803 (68.3) | 642 (58.1) | 11 (100.0) | 210 (68.9) | 36 (57.1) |
| Metal-on-HXLPE, all head sizes | ||||||
| Age, 45-54 yr | 893 (19.7) | 2030 (23.0) | 33 (11.6) | 94 (26.7) | 38 (22.6) | 51 (25.4) |
| Age, 55-64 yr | 3635 (80.3) | 6808 (77.0) | 252 (88.4) | 258 (73.3) | 130 (77.4) | 150 (74.6) |
| Male | 2018 (44.6) | 4423 (50.0) | 145 (50.9) | 176 (50.0) | 62 (36.9) | 119 (59.2) |
| Female | 2510 (55.4) | 4415 (50.0) | 140 (49.1) | 176 (50.0) | 106 (63.1) | 82 (40.8) |
*
KP = Kaiser Permanente, E-R = Emilia-Romagna region, HE = HealthEast, and C = Catalan region.