What should you know about knee swelling after knee replacement?

Knee swelling after knee replacement can accompany healing, but worsening symptoms or wound changes need prompt clinical advice. Compare the knee with its recent pattern and follow the rehabilitation instructions from your surgical team.

Surgery temporarily irritates tissues and the joint, so swelling may fluctuate with walking and physiotherapy. It can make bending harder and may extend around the lower leg. A new increase after a period of improvement is more concerning than a stable pattern. Warmth, drainage, spreading redness, fever, escalating pain, or a sudden loss of function need review. A Baker's cyst, gout, knee bursitis, or another joint problem can also produce swelling, but a clinician must distinguish these from postoperative concerns.

Your surgeon or physiotherapist can assess the wound, calf, range of motion, gait, and rehabilitation load. Do not change prescribed medicines or exercises without guidance.

Use the elevation, cold-pack, compression, walking, and exercise plan provided by your care team. Keep dressings and the wound area as instructed, and avoid placing ice directly on skin or wound coverings unless told it is suitable. Increase activity in small steps; swelling that rises after a session is a reason to discuss the workload. Continue prescribed ankle and circulation exercises when allowed.

Contact the surgical team promptly for increasing redness, wound drainage, fever, worsening pain, new calf pain or swelling, or a sudden reduction in movement. Seek urgent help for chest pain, breathlessness, fainting, or a foot that becomes cold, pale, numb, or weak. A knee that becomes suddenly much more swollen also deserves prompt advice.

Ask what swelling pattern is expected at your stage, how much walking and exercise is appropriate, and how to protect the wound. Ask which symptoms require same-day contact and whether fluid testing or imaging would be useful if swelling changes.