Clinical Research Directory

Please see https://drive.google.com/drive/folders/1WD618wrywYjEaXzfLTcuK-VCcnb6b-gV for full code and algorithm definitions. Inclusion Criteria: * At least 18 years of age * Scheduled to undergo elective total hip arthroplasty Exclusion Criteria: * Scheduled to undergo staged, bilateral hip arthroplasty \[Day -30, Day 0\] * Pregnany or breastfeeding \[Day -180, Day 0\] * Had active bleeding or high risk of bleeding \[Day -180, Day 0\] * Had conditions preventing bilateral venography \[Day -30, Day 0\] * Congestive heart failure \[Day -180, Day 0\] * Pulmonary hypertension \[Day -180, Day 0\] * Edema of legs \[Day -180, Day 0\] * Substantial liver disease \[Day -180, Day 0\] * Severe renal impairment (creatinine clearance \<30 ml per minute) \[Day -180, Day 0\] * Concomitant use of protease inhibitors for the treatment of HIV \[Day -180, Day 0\]