Clinical trial Recruiting at 1 site Phase 2 Interventional Ages 19 and up

Comparing daily doses of aspirin to prevent blood clots after joint surgery

Official title: Optimal Dosing For Low-Dose Aspirin Chemoprophylaxis For Venous Thromboembolism (VTE) Following Total Joint Arthroplasty - A Multi-center Prospective Randomized Control Trial.

Run by University of Miami · NCT04295486 · Data updated 2026-11-12

This study tests if taking a low dose of aspirin once a day is just as good as taking it twice a day to prevent blood clots in people having hip or knee surgery.

More Venous Thromboembolism trials

Quick facts

PhasePhase 2
Study typeInterventional
Ages19 Years and up
SexAll
Enrollment5478 (estimated)
SponsorUniversity of Miami
Academic / other
Locations1 site (Miami, Florida)
StatusRecruiting
StartedMarch 1, 2021
Main results expectedMarch 1, 2027
Study endsMarch 1, 2027
Registry record updatedMarch 11, 2026
Trial IDNCT04295486 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults over 18 years old who are planning to undergo primary total hip or knee arthroplasty.

Probably not a fit

Patients with a history of venous thromboembolism, active malignancy, or other high-risk factors for VTE may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates whether taking 81 mg of aspirin once daily is as effective as taking it twice daily for preventing venous thromboembolism (VTE) in patients undergoing total hip or knee arthroplasty. The study aims to determine the optimal dosing strategy for aspirin chemoprophylaxis in this patient population. Participants will be monitored for the occurrence of blood clots following their surgery. The trial is designed to provide insights into the most effective aspirin regimen for reducing VTE risk.

Why it matters

Potential benefit: If successful, this study could lead to improved guidelines for aspirin use in preventing blood clots after joint replacement surgeries.

How similar studies have gone: Other studies have explored aspirin dosing for VTE prevention, but this specific comparison of once versus twice daily dosing is novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
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

Where it's running

  • University of Miami Hospital
    Miami, Florida, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.