Table 1.
Baseline characteristics.
| RA patients (N = 252) | |
|---|---|
| Age, years (mean ± SD) | 62.7 ± 11.0 |
| Female, n (%) | 209 (83.3) |
| BMI (mean ± SD) | 29.3 ± 6.8 |
| Diagnosis Duration, years (mean ± SD) | 14.1 ± 12.0 |
| Type of surgery, n (%) | |
| TKA | 146(57.9) |
| THA | 106 (42.1) |
| Race, n (%) | |
| White | 186 (73.8) |
| Black | 27 (10.7) |
| Asian | 6 (2.4) |
| Other | 33 (2.4) |
| Smoking, n (%) | 115 (51.6) |
| Education, n (%) | |
| Less than College | 31 (14.0) |
| College or above | 190 (86.0) |
| Employment, n (%) | |
| Employed | 84 (38.2) |
| Unemployed, Disabled or Retired | 125 (56.8) |
| Other | 11 (5.0) |
| Ethnicity, n (%) | |
| Hispanic or Latino | 18 (7.7) |
| Not Hispanic or Latino | 211 (90.6) |
| Do not wish to answer | 4 (1.7) |
| Criteria, n (%) | |
| Meet both criteria | 101 (43.9) |
| 1987 | 32 (13.9) |
| 2010 | 54 (23.5) |
| Does not meet criteria(diagnosis per PI) | 43 (18.7) |
| Preoperative medications, n(%) | |
| NSAIDS | 135 (57.2) |
| Steroids | 87 (36.1) |
| Methotrexate | 117 (48.8) |
| DMARD | 70 (29.3) |
| Opioids | 88 (37.0) |
| Biologic | 128 (53.6) |
| Preop hemoglobin, g/dl (mean ± SD) | 12.8 ± 1.5 |
| 268.0 ±77.1 | |
| Hx of previous transfusion, n (%) | 9 (3.9) |
| Hx of DVT, n (%) | 11 (4.7) |
| Hx of PE, n (%) | 4 (1.7) |
| Hx of CVA, n (%) | 10 (4.3) |
| Hx of Stroke, n (%) | 7 (3.0) |
| Hx of Malignancy, n (%) | 21 (9.0) |
| Hx of Hormone Therapy, n (%) | 20 (8.6) |
| History of Myocardial Infraction, n (%) | 2 (0.9) |
| Estimated blood loss, mL (mean ± SD) | 188.8±65.3 |
| 986.8 ±74.1 | |
| 2928.6 ± 323.3 | |
| Surgery Duration, minutes (mean ± SD) | 92.4 ± 32.8 |
| Post op transfusion needed?, Yes n (%) | 26 (11.2) |
| 5 (2.0) | |
| 12 (4.8) | |
| 3 (1.2) | |
| 2 (0.8) | |
| 2 (0.8) | |
| MDHAQ, (mean ± SD) | 3.8 ± 1.7 |
| DAS28—ESR, (mean ± SD) | 3.7 ± 1.3 |
| CDAI, (mean ± SD) | 18.4 ± 10.9 |
| ESR result (mean ± SD) | 20.4 ± 19.7 |
| CRP result (mean ± SD) | 1.7 ± 2.5 |
| 178.2±329.1 | |
| 362.5±605.9 | |
| HOOS/KOOS Pain (mean ± SD) | 40.3 ± 20.1 |
| HOOS/KOOS Function (mean ± SD) | 46.2 ± 21.1 |
| Length of stay, hours (mean ± SD) | 81.8 ± 36.7 |
RA rheumatoid arthritis, BMI body mass index, TKA total knee arthroplasty, THA total hip arthroplasty, PI principal investigator NSAIDS nonsteroidal anti-inflammatory drugs, DMARD disease modifying anti-rheumatic drugs, DVT deep vein thrombosis, PE pulmonary embolus, CVA cerebrovascular accident, MDHAQ Multi-dimensional Health Assessment Questionnaire, DAS Disease Activity Score, ESR erythrocyte sedimentation rate, CDAI Clinical Disease Activity Index, CRP C-reactive protein, HOOS Hip Disability and Osteoarthritis Outcomes Score, KOOS Knee Injury and Osteoarthritis Outcomes Score.