Revision knee surgery or revision knee replacement is performed when an artificial prosthetic that was put in place of an original bone to relieve the pain wears out over a period of time. Yes, even the prosthetics that replace a bone for natural movement in the body are subject to wear and tear. Made of sterile materials, these prosthetics have a life span of about 10-12 years. However, it may vary under individual circumstances. Revision knee surgery is one of the most common revision surgeries performed world over because our knees bear and redistribute most of the body weight. Every agile activity of life includes movement of knees; hence their rate of wearing out is faster than any other joint or prosthetic.