Table 4.
Demographic characteristics of primary TKA with ALBC by registry
| Variable | AJRR | AOANJRR | DKR | EPRD | FAR | JointCare | KP | LROI | NAR |
|---|---|---|---|---|---|---|---|---|---|
| TKA with ALBC | 241,866 | 393,897 | 37,442 | 139,673 | 83,395 | 829 | 51,463 | 195,155 | 40,709 |
| Female sexa | 145,418 (60) | 226,436 (58) | 23,259 (62) | 92,275 (66) | 54,187 (65) | 551 (67) | 31,270 (61) | 125,841 (65) | 25,242 (62) |
| Age groupb | |||||||||
| < 55 | 21,259 (8.8) | 23,406 (5.9) | 2565 (6.8) | 10,013 (7.2) | 5,318 (6.4) | 67 (8.1) | 3,323 (6.5) | 12,502 (6.4) | 5,599 (14) |
| 55–64 | 70,351 (29) | 100,317 (26) | 7,940 (21) | 33,797 (24) | 20,946 (25) | 249 (30) | 15,160 (30) | 48,770 (25) | 8,038 (20 |
| 65–74 | 96,199 (40) | 160,880 (41) | 15,235 (41) | 46,879 (34) | 31,885 (38) | 327 (39) | 21,323 (41) | 79,073 (41) | 15,194 (37) |
| ≥ 75 | 54,057 (22) | 109,294 (28) | 11,702 (31) | 48,984 (35) | 25,246 (30) | 186 (22) | 11,658 (23) | 54,649 (28) | 11,878 (29) |
| ASA class | na | na | na | ||||||
| I | 15,606 (4.0) | 2,056 (1.5) | 3,370 (4.0) | 655 (1.3) | 28,422 (15) | 3,737 (9.2) | |||
| II | 162,375 (41) | 7,898 (5.6) | 25,392 (30) | 30,790 (60) | 131,168 (67) | 27,457 (67) | |||
| III | 121,261 (31) | 4,493 (3.2) | 19,704 (24) | 18,677 (36) | 34,310 (18) | 8,539 (21) | |||
| IV–V | 3,493 (1.0) | 75 (0.1) | 473 (0.6) | 305 (0.6) | 449 (0.2) | 71 (0.2) | |||
| Missing | 91,162 (23) | 125,208 (90) | 34456 (41) | 1,036 (2.0) | 806 (0.4) | 905 (2.2) | |||
| BMI categoryc | na | ||||||||
| Underweight | 270 (0.3) | 441 (0.2) | 105 (0.3) | 175 (0.1) | 48 (0.1) | 4 (0.5) | 77 (0.1) | 195 (0.1) | |
| Normal | 8,871 (9.8) | 24,479 (10) | 6,374 (17) | 12,610 (9.0) | 6,317 (7.6) | 95 (12) | 5,736 (11.1) | 22,222 (11.4) | |
| Pre-obese | 24,250 (27) | 72,070 (31) | 12,691 (34) | 31,072 (22) | 17,444 (21) | 219 (26) | 16,039 (31) | 57,431 (29) | |
| Obese class 1 | 26,212 (29) | 71,974 (31) | 8,309 (22) | 26,413 (19) | 14,740 (18) | 253(31) | 16,319 (32) | 40,270 (21) | |
| Obese class 2 | 18,603 (21) | 40,592 (17) | 3,532 (9.4) | 12,885 (9.2) | 6,312 (7.6) | 150 (18) | 9,742 (18.9) | 15,388 (7.9) | |
| Obese class 3 | 12,107 (13) | 25,550 (11) | 1,577 (4.2) | 7,216 (5.2) | 1,650 (2.0) | 108 (13) | 3,517 (6.8) | 5,494 (2.8) | |
| Missing | 151,553 (63) | 158,791 (40) | 4,853 (13) | 49,302 (35) | 36,884 (44) | 33 (0.1) | 54,155 (28) | ||
| Variable | NJR | NZJR | PABZ | PATN | RAR | SAR | SIRIS | Total | |
| TKA with ALBC | 810,644 | 60,173 | 4,540 | 970 | 17,818 | 123,088 | 91,784 | 2,293,446 | |
| Female sex | 463,557 (57) | 31,032 (52) | 2,925 (64.4) | 561 (58) | 13,822 (78) | 70,452 (57) | 55,210 (60) | 1,361,082 (59) | |
| Age group b | |||||||||
| < 55 | 46,596 (5.7) | 4,365 (7.3) | 120 (2.6) | 42 (4.3) | 809 (4.5) | 6,287 (5.1) | 6,055 (6.6) | 148,326 (6.5) | |
| 55–64 | 181,159 (22) | 17,054 (28) | 659 (15) | 178 (18) | 5,211 (29) | 28,738 (23) | 21,925 (24) | 560,492 (24) | |
| 65–74 | 325,568 (40) | 24,098 (40) | 1,934 (43) | 413 (43) | 8,836 (50) | 49,937 (41) | 34,089 (37) | 911,870 (40) | |
| ≥ 75 | 257,321 (32) | 14,656 (24) | 1,827 (40) | 337 (35) | 2,313 (17) | 38,123 (31) | 29,649 (32) | 906,910 (40) | |
| ASA class | na | ||||||||
| I | 68,137 (8.4) | 6,151 (10) | 397 (8.7) | 8 (0.8) | 20,918 (17) | 6,312 (6.9) | 155,769 (6.8) | ||
| II | 595,982 (74) | 38,104 (63) | 2,285 (50) | 180 (19) | 80,930 (66) | 43,391 (47) | 1,145,952 (50) | ||
| III | 144,145 (18) | 15,101 (25) | 288 (6.3) | 27 (2.8) | 20,832 (16.9) | 19,611 (21.4) | 406,988 (18) | ||
| IV–V | 2,380(0.3) | 102 (0.3) | 2 (0.0) | 235 (0.2) | 264 (0.3) | 7,953 (0.3) | |||
| Missing | 611 (1.0) | 1,568 (35) | 755 (78) | 173 (0.1) | 22,206 (24) | 278,886 (12) | |||
| BMI category c | na | na | na | ||||||
| Underweight | 950(0.1) | 67 (0.1) | 181 (0.1) | 298 (0.3) | 2,811 (0.1) | ||||
| Normal | 58,700 (7.2) | 4,343 (7.2) | 22,203 (18.0) | 13,150 (14.3) | 185,100 (8.1) | ||||
| Pre-obese | 207,996 (26) | 13,628 (23) | 53,221 (43.2) | 24,457 (26.6) | 530,518 (23) | ||||
| Obese class 1 | 201,963 (25) | 12,639 (21) | 34,747 (28.2) | 15,778 (17.2) | 469,617 (21) | ||||
| Obese class 2 | 104,287 (13) | 7,100 (12) | 10,440 (8.5) | 6,596 (7.2) | 235,627 (10) | ||||
| Obese class 3 | 44,072 (5.4) | 4,051 (6.7) | 2,113 (1.7) | 2,946 (3.2) | 110,401 (4.8) | ||||
| Missing | 192,676 (24) | 18,345 (31) | 183 (0.1) | 28,559 (31.1) | 684,628 (30) | ||||
Missing cases:
a
AJRR (n = 333); LROI (n = 228).
b
LROI (n = 161); SAR (n = 3); SIRIS (n = 490).
c
BMI categories are based on WHO classification: underweight (<18.5), normal (18.5–< 25), pre-obese (25–< 30), obese class 1 (30–< 35), obese class 2 (35–< 40), and obese class 3 (≥ 40.00). na = not available.