Clinical Research Directory

Inclusion criteria: * \> 18 years of age * Planning to undergo a primary total hip or knee arthroplasty Exclusion Criteria: * High risk patients for VTE as defined by: * History of venous thromboembolism * Active malignancy * Known pro thrombotic condition * BMI \> 40 * Patients requiring anticoagulation for pre-existing conditions * Patients with the contraindication for use of aspirin or nonsteroidal antiinflammatory drugs for reasons such as peptic ulcer disease, intolerance, others. * Patients not fluent in the language of the informed consent form * Prisoners * Pregnancy * Reported to have mental illness or belonging to a vulnerable population