Use of advanced technology in knee replacement surgery has made this procedure more accurate and long lasting. The availability of advanced prosthetic materials provide orthopedic surgeons with options that helps increase the longevity of the prosthesis. Studies have shown well-aligned knee replacement may last longer and be more functional. This can be achieved by the use of computer navigation for knee replacement surgery. Computer assisted surgery can help the surgeon to align the patient’s bone and implants accurately which is not possible with the naked eye. It can also help in ligament balancing that insures better range of motion. With CAS technology surgeons are able to make accurate adjustments to ensure the optimal implant fit, which reduces joint wear and extends the life of the implant. Other benefits of CAS are:- reduces the size of incision less blood loss during surgery prevent damages to muscles and ligaments shorten time to recovery