Table 1.
Demographic and Operative Data
| Study Group | Control Group | P Value | |
| N = 38 | N = 241 | ||
| Mean Age (years) | 67 | 63 | 0.11 |
| Female Sex | 33 (87%) | 171 (71%) | 0.07 |
| Thromboembolic Prophylaxis | 0.79 | ||
| Enoxaparin Sodium | 37 (97%) | 228 (95%) | |
| Warfarin | 1(3%) | 13 (6%) | |
| History of Prior Thromboembolism | 5(13%) | 3 (1%) | <0.001 |
| Family History of Thromboembolism | 3 (8%) | 5 (2%) | <0.001 |
| Percent Ideal Body Weight | 139% | 147% | 0.23 |
| History of Smoking | 3 (8%) | 20 (7%) | 0.77 |
| Procedure | 0.21 | ||
| Primary Total Hip Arthroplasty | 10(26%) | 94 (39%) | |
| Primary Total Knee Arthroplasty | 25 (66%) | 113 (47%) | |
| Revision Total Hip Arthroplasty | 1 (3%) | 20 (8%) | |
| Revision Total Knee Arthroplasty | 2 (5%) | 14 (6%) | |
| Preoperative Diagnosis: Hips | 0.71 | ||
| Osteoarthritis | 6 (55%) | 75 (66%) | |
| Rheumatoid Arthritis | 1 (9%) | 4 (4%) | |
| Failed Implant | 1 (9%) | 20 (18%) | |
| Other | 3 (27%) | 15 (12%) | |
| Preoperative Diagnosis: Knees | 0.8 | ||
| Osteoarthritis | 22 (81%) | 101 (79%) | |
| Rheumatoid Arthritis | 2 (7%) | 7 (6%) | |
| Failed Implant | 1 (4%) | 14 (11%) | |
| Other | 2 (8%) | 5 (4%) | |
| Estimated Blood Loss (milliliters) | 323 | 425 | 0.21 |
| OperativeTime (minutes) | 128 | 145 | 0.24 |
| Anesthetic | 0.09 | ||
| Neuraxial | 30 (78%) | 142 (59%) | |
| General | 8 (22%) | 99 (41%) |