Excessive Swelling After Knee Replacement Surgery: What to Know

Healing tissues, temporary fluid accumulation, and reduced movement can make the knee look puffy and feel tight. Swelling may become more noticeable after walking or physiotherapy and may ease with rest and elevation. A new change after initial improvement, spreading redness, wound drainage, fever, or calf swelling can point to infection, bleeding, or a blood-flow problem and should not be judged from appearance alone. Knee swelling can have other causes too; background information is available under Knee Swelling.

Follow the movement, dressing, and medication instructions from your surgical team. Rest with the leg supported above heart level when advised, use cold therapy only as directed and protect the skin, and take short gentle walks rather than staying still for long periods. Do not massage a newly swollen calf or change prescribed blood-thinning medicine without guidance. Record when the swelling began, whether it is worsening, and any temperature or wound changes. A clinician may examine the joint and, when appropriate, consider Joint Aspiration to investigate or relieve fluid.

Contact your surgical team promptly for swelling that is getting worse, pain that is not controlled, increasing warmth or redness, wound leakage, fever, or difficulty bearing weight. Seek emergency help for sudden calf or thigh swelling with chest pain, breathlessness, faintness, or coughing blood. Urgent assessment is also needed if the foot becomes cold, pale, numb, or weak.

Ask whether the swelling pattern fits your stage of recovery, how often to elevate or use cold therapy, which exercises are appropriate today, and which wound or calf changes should trigger a same-day call. Ask how your medicines affect bruising or swelling and when the knee should be rechecked.