Following a knee replacement surgery, you may participate in low-impact aerobic activities such as walking, hiking. biking, and swimming. Activities that should be avoided are those that are high-impact and have a high risk of injury, and contact sports such as basketball or soccer. These types of activities may result in damage to the implant. To learn more about the different activities that may or may not be done after a knee replacement surgery, you can read here: http://orthoontheweb.com/pdfs/Activity_After_Knee_Replacement.pdf
Water aerobics and low impact aerobics are suitable for recovery from knee surgery. Low impact aerobics provides benefits for knee surgery rehabilitation. These benefits include muscle toning, help in weight reduction and a painkiller.