Cases of Elbow Replacement, n = 34 | Controls, RA No Previous Joint Replacement, n = 34 | p | Controls, RA with Hip Replacement, n = 34 | p | |
---|---|---|---|---|---|
Age, yrs, mean (SD) | 64.3 (11.8) | 63.4 (10.0) | 0.36 | 65.1 | 0.41 |
Female | 29/34 (85.3) | 29/34 (85.3) | 1.0 | 29/34 (85.3) | 1.0 |
New Zealand European | 32/34 (94.1) | 34/34 (100) | n/a | 31/34 | 1.0 |
Duration of RA, mean (SD) | 27.4 (11.5) | 24.8 (10.2) | 0.04 | 24.3 (10.9) | 0.02 |
RF-positive | 27/34 (85.3) | 27/32 (84.3) | 1.0 | 23/30 (80.0) | 0.75 |
Radiographic erosions | 34/34 (100) | 28/31 (90.3) | n/a | 29/29 (100) | 1.0 |
Nodules | 4/34 (11.8) | 13/33 (39.4) | 0.02 | 11/31 (35.5) | 0.09 |
No. DMARD at time of surgery, mean (range) | 1.03 (0–3) | 1.03 (0–3) | 1.0 | 0.65 (0–2), n = 31 | 0.02 |
Biologic at time of surgery | 3/34 (8.8) | 1/34 (2.9) | 0.50 | 2/31 (6.5) | 1.0 |
Oral prednisone at time of surgery | 15/34 (44.1) | 7/34 (20.6) | 0.12 | 16/32 (50) | 0.83 |
No. DMARD in past, mean (range) | 2.71 (0–7) | 1.97 (0–7) | 0.08 | 2.45 (0–6), n = 31 | 0.47 |
Biologic in past | 2 (5.9) | 1 (2.9) | 1.0 | 0 (0) | n/a |
Oral steroid in past | 25 (73.5) | 17 (50) | 0.003 | 26/31 (83.9) | 0.09 |
IA steroid in past | 28/33 (87.9) | 18/33 (54.5) | 0.006 | 20/30 (66.7) | 0.07 |
Previous joint replacement | 25/34 (73.5) | 0 | n/a | 18/32 (56.3) | 0.13 |
No. previous joint replacements | 2.18 (0–7) | 0 | n/a | 1.15 (0–5) | 0.02 |
RA: rheumatoid arthritis; RF: rheumatoid factor; DMARD: disease-modifying antirheumatic drugs; IA: intraarticular; n/a: not applicable.