Inclusion Criteria:

Adult patient (Age >18). Patient intended to undergo elective primary unilateral THA surgery. Patient is able and willing to follow instructions of care after surgery. Patient is able and willing to sign the institution human subjects committee approved Informed Consent Form.

Exclusion Criteria:

Patient who has a known coagulation disorder. Patient currently treated with anticoagulant medications. Patient with known thrombophilia Patient with current signs and symptoms of or history of DVT/PE. Patient who is uncooperative or unable to follow instructions. Patient currently suffering from a solid tumor malignancy. Patient with active peptic disease. Patient with known allergy to baby aspirin (81 mg) or enoxaparin. Patient with contraindication to use of the device including patients with leg gangrene, recent skin graft or medical situations where increase venous and lymphatic return is undesirable.Patient has major surgery procedure within 3 months prior to the study surgery, or patients with a major surgery procedure planning during the study period.Pregnant women.Patient who is participating in another clinical drug trial.