Blood Clots After Hip Replacement
Direct Answer
Hip replacement temporarily increases the risk of a blood clot in a deep vein, called deep vein thrombosis or DVT. A clot can form in the calf, thigh or pelvis. If part of it travels to the lungs, it can cause a pulmonary embolism, which is a medical emergency. Many clots cause few symptoms, so prevention is planned for each patient rather than waiting for pain or swelling to appear.
Prevention may combine early movement, ankle exercises, a prescribed blood-thinning medicine and mechanical measures such as stockings or compression devices. The exact medicine, dose and duration depend on clotting risk, bleeding risk, kidney function, other medicines and the surgeon’s protocol. Patients should not start, stop or double a blood thinner without medical advice. The prevention plan should also be reviewed when recovery is interrupted by readmission, prolonged immobility or another new medical problem.
Who May Have a Higher Risk?
Risk can be higher with a previous DVT or pulmonary embolism, known clotting disorder, active cancer, marked immobility, smoking, obesity, hormone treatment, some medical illnesses or a family history. Age and the complexity of surgery can also matter. Risk assessment should occur before surgery so that medication, mechanical prevention and travel plans can be individualized.
How Blood Clots Are Prevented
Walking as advised, changing position, ankle pumps and adequate hydration help maintain circulation. Prescribed prevention can range from aspirin to another anticoagulant; one option is not correct for every patient. Compression devices or stockings may be advised, but they must fit correctly and should not make the foot numb, cold or discoloured. Prevention must be balanced against bleeding and wound problems.
Possible DVT Symptoms
Possible signs include new one-sided calf or thigh swelling, pain or tenderness, warmth, redness, or a leg that becomes noticeably larger than the other. Normal postoperative swelling can complicate interpretation, and DVT can be present without obvious symptoms. New or increasing unilateral swelling should be assessed rather than massaged or treated only with home remedies.
Pulmonary Embolism Is an Emergency
Sudden breathlessness, chest pain, coughing blood, a rapid heartbeat, fainting, collapse or unexplained severe anxiety after surgery can signal a pulmonary embolism. Call emergency services immediately. Do not drive yourself to a clinic or wait to see whether the symptom settles. Emergency teams may use oxygen, blood tests and imaging while beginning treatment when appropriate.
How a Suspected Clot Is Assessed
A clinician considers symptoms, examination and time from surgery. Ultrasound is commonly used for suspected leg DVT, while chest imaging may be needed for pulmonary embolism. Blood tests alone cannot safely rule in every postoperative clot because surgery affects several results. Treatment depends on clot location, symptoms, bleeding risk and overall health.
Travel After Hip Replacement
Long periods of sitting can add to postoperative immobility. Discuss flights or long car journeys with the surgeon, especially when clot risk is above average. Continue only the prevention prescribed to you. Frequent movement, ankle pumps and hydration may be advised, but travel timing also depends on pain, wound condition, safe transfers and access to medical care at the destination.
Medication and Bleeding Precautions
Seek advice for uncontrolled bleeding, black stools, vomiting blood, severe headache after a fall, rapidly expanding bruising or persistent wound drainage while taking an anticoagulant. Minor bruising can occur, but it should not be used to adjust the dose without guidance. Tell dentists and other clinicians which blood thinner you are taking and why.
Questions Patients Commonly Ask
How long does clot risk remain after hip replacement?
Risk is highest around surgery and early recovery but does not end on a single universal day. The surgeon chooses prevention duration from the patient’s risk profile and procedure.
Does calf pain always mean a DVT?
No. Muscle soreness and swelling are common after surgery, but a new one-sided pattern cannot be safely diagnosed at home. Assessment may include ultrasound.
Can I take an extra aspirin before a flight?
Not unless the treating clinician directs it. Extra aspirin or anticoagulant can increase bleeding and may interact with the prescribed plan.
What should I do for sudden breathlessness after surgery?
Treat it as an emergency. Call emergency services immediately because pulmonary embolism and other serious heart or lung problems require prompt assessment.
Related Hip-Replacement Safety Guides
Continue with Hip Replacement Risks and Complications, Preparing for Hip Replacement, Walking After Hip Replacement, and Life After Hip Replacement for the connected diagnosis, treatment and recovery pathways.
Explore the complete Hip Guides hub for all related patient guides.
Clinical References and Further Reading
AAOS OrthoInfo: Deep Vein Thrombosis
AAOS OrthoInfo: Total Hip Replacement
AAHKS: Traveling After Hip Replacement Surgery
About the Medical Author
Dr. Mayur Rabhadiya is an Orthopedic and Joint Replacement Surgeon in Mumbai. His hip practice includes preoperative risk assessment, primary and revision replacement planning, and diagnosis-led review of postoperative concerns.
Qualifications: MBBS, D’Ortho, DNB (Orthopedics), MNAMS (Orthopedics), FIJR (Robotic & Navigation).
Last medically reviewed: 17 July 2026. Medical reviewer: Dr. Mayur Rabhadiya.
Book a Hip-Replacement Follow-Up in Mumbai
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Medical Disclaimer
This guide is for general patient education and does not replace a personal consultation, examination, diagnosis or treatment plan. Seek urgent medical care for severe or rapidly worsening symptoms, fever with wound problems, sudden inability to bear weight, chest pain, breathlessness, fainting or new neurological symptoms.