Swollen thigh after knee replacement: what to know

After surgery, tissue irritation, bruising, reduced movement, and gravity can allow fluid to collect above or around the knee. Swelling may shift down the leg or feel more noticeable in the thigh as activity changes. It should be considered alongside pain, temperature, wound appearance, and overall function. A blood clot is a serious possibility when swelling is one-sided and accompanied by calf or thigh pain, warmth, or tenderness. Infection can cause increasing pain, redness, wound drainage, fever, or feeling unwell. A knee problem such as a Baker's cyst is not the usual explanation for early postoperative changes, but clinicians may consider other causes when swelling persists or follows a new change.

Follow the surgical team's instructions for walking, exercises, elevation, dressings, and prescribed medicines. Elevate the leg as advised and use cold therapy only in the way your team recommends, protecting the skin and wound. Keep gentle ankle and knee movements within the rehabilitation plan, and avoid suddenly increasing walking or standing. Do not massage a swollen thigh or stop prescribed clot-prevention medicine without contacting the surgical team. Compare the swelling from day to day and report a clear increase rather than waiting for the next routine visit.

Contact the surgical team promptly for swelling that is rapidly increasing, new severe pain, spreading redness, wound drainage, fever, or a leg that becomes unusually tense or tender. Seek emergency help for chest pain, sudden breathlessness, coughing blood, fainting, or severe weakness. New inability to bear weight, a fall, or sudden loss of knee movement also needs urgent clinical guidance. A clinician may examine the leg and arrange imaging; joint aspiration is a procedure sometimes used to assess or relieve fluid in a joint, but it is not a home treatment.

Does this swelling fit my expected recovery pattern? Which changes should be reported the same day? How should I elevate and exercise the leg? Could I need an ultrasound, X-ray, or another assessment?