Swollen Foot After Knee Surgery: What to Know

Gravity can allow fluid from the operated leg to collect around the ankle and foot, especially when the leg hangs down. A tight dressing, limited ankle movement, or prolonged sitting can add to the puffiness. Swelling that is gradually settling is different from swelling that suddenly increases. Painful warmth, spreading redness, calf tenderness, or a foot that becomes unusually pale, blue, cold, numb, or weak needs prompt medical attention. The operation itself does not explain every change, and the surgical team may need to check the wound, circulation, and leg.

Follow the discharge instructions for walking, exercises, and weight-bearing. When resting, raise the leg with the foot supported above the level of the heart if your clinician has allowed this. Gentle ankle pumps may help if they are part of your rehabilitation plan. Avoid changing a dressing, tightening a support, massaging the calf, or starting compression without advice. Compare both feet for colour, temperature, sensation, and movement, and record whether the swelling improves after elevation.

Contact the surgical team promptly if swelling is worsening, one-sided and tense, or accompanied by increasing pain, redness, warmth, wound drainage, fever, or calf pain. Seek emergency help for sudden breathlessness, chest pain, faintness, or coughing blood. A cold or blue foot, new loss of sensation, or inability to move the toes also needs urgent assessment.

Ask whether your swelling pattern fits expected recovery, which exercises and elevation position are suitable, and whether your dressing or medication needs review. Ask what change should trigger a same-day call.