SpA cohort | Non-SpA cohort | |||||||||||
OS (all) | THA | TKA | ULA | Arthrodesis | Spinal surgery | OS (all) | THA | TKA | ULA | Arthrodesis | Spinal surgery | |
N (% of OS) | 5400 (100) | 2261 (41.9) | 1115 (20.6) | 345 (6.4) | 172 (3.2) | 1525 (28.2) | 3540 (100) | 1220 (34.5) | 1209 (34.2) | 482 (13.6) | 75 (2.1) | 561 (15.8) |
Mean age (SD) | 58.97 (13.50) | 57.76 (14.11 | 64.83 (10.28) | 54.89 (12.59) | 52.07 (12.31) | 58.15 (13.62) | 63.67 (12.58) | 67.28 812.35) | 68.38 (7.85) | 55.59 (11.85) | 50.76 (12.24) | 54.3 (12.42) |
Mean Charlson index (SD) | 0.45 (0.94) | 0.37 (0.80) | 0.38 (0.71) | 0.32 (0.65) | 0.23 (0.48) | 0.68 (1.29) | 0.33 (0.89) | 0.45 (1.05) | 0.28 (0.61) | 0.17 (0.50) | 0.19 (0.53) | 0.38 (1.24) |
Average length of stay in days (SD) | 16.31 (25.43) | 11.53 (11.73) | 9.89 (11.30) | 4.29 (16.11) | 4.74 (9.33) | 32.05 (39.6) | 9.12 (11.12) | 11.3 (12.07) | 8.4 (6.50) | 3.08 (4.29) | 4.03 (5.77) | 12.23 (20.01) |
Male n (%) | 3439 (63.7) | 1704 (75.4) | 562 (50.4) | 159 (46.1) | 82 (47.7) | 940 (61.6) | 1866 (52.7) | 712 (58.4) | 480 (39.7) | 257 (53.3) | 44 (58.7) | 375 (66.8) |
Death during admission, n (%) | 69 (1.3) | 15 (0.7) | 2 (0.2) | 0 (0) | 0 (0) | 52 (3.4) | 17 (0.5) | 13 (1.1) | 0 (0) | 0 (0) | 0 (0) | 4 (0.7) |
Diabetes mellitus (%) | 601 (11.1) | 184 (8.1) | 156 (14) | 38 (11) | 13 (7.6) | 212 (13.9) | 356 (10.1) | 133 (10.9) | 147 (12.2) | 29 (6) | 3 (4) | 45 (8) |
Hypertension (%) | 1695 (31.4) | 642 (28.4) | 510 (45.7) | 90 (26.1) | 22 (12.8) | 437 (28.7) | 1169 (33) | 412 (33.8) | 539 (44.6) | 87 (18) | 9 (12) | 123 (21.9) |
Smoking (%) | 326 (6.0) | 118 (5.2) | 32 (2.9) | 22 (6.4) | 12 (7) | 144 (9.4) | 149 (4.2) | 43 (3.5) | 26 (2.2) | 20 (4.1) | 8 (10.7) | 53 (9.4) |
Deep vein thrombosis (%) | 6 (0.1) | 1 (0.1) | 2 (0.2) | 0 (0) | 0 (0) | 3 (0.2) | 2 (0.1) | 1 (0.1) | 0 (0) | 0 (0) | 0 (0) | 1 (0.2) |
Dementia (%) | 15 (0.3) | 13 (0.6) | 0 (0) | 0 (0) | 0 (0) | 2 (0.1) | 15 (0.4) | 13 (1.1) | 2 (0.2) | 0 (0) | 0 (0) | 0 (0) |
Depression (%) | 280 (5.2) | 87 (3.8) | 73 (6.5) | 30 (8.7) | 4 (2.3) | 86 (5.6) | 167 (4.7) | 47 (3.9) | 64 (5.3) | 19 (3.9) | 4 (5.3) | 35 (6.2) |
AS, ankylosing spondylitis; OS, orthopaedic surgery; PsA, psoriatic arthritis; SpA-IBD, spondyloarthritis associated with inflammatory bowel disease; THA, total hip arthroplasty; TKA, total knee arthroplasty; ULA, upper limb arthroplasty.