Hip or knee replacement is probably the most successful of operations, as its outcomes are good most of the time. However it is a major surgical procedure, may require approximately five to six days in hospital, often one night in ICU immediately after the surgery. Every patient is different, depending on age, psychological make-up, and co-existing medical conditions. Some patients walk independently with no crutches after a week, and others may take 6 weeks or longer. It is prudent to take off work for at least 6 weeks. You will walk on day one after surgery, with the help of a physiotherapist. It is important to get going early, as prolonged bedrest is harmful, as it can lead to blood clots, pneumonias, and even bedsores. Getting up and walking early will not harm the implants in any way. Pain usually subsides over a few days. After knee replacements, expect swelling to last for many months, even after 6 months. Although long term outcome is usually good, it is wise to be sensible with your new hip or knee joint. It is after all a mechanical device and therefore can wear out over time. No Marathons, but everyday activities are fine!