Computer Assisted Orthopedic Surgery is a system where a computer interacts with body parts via infrared lights and gate detectors. There are systems that require C-Arm images or CAT scans, flourabased systems and the newest and most evolved systems are imageless systems, this means that no pre scans of any kind are necessary. The imageless systems are far less complicated, are lower cost and more patient friendly since the pre scans are not necessary. The imageless systems will also bring down operation time. The negative aspect of imageless systems is that they might be less accurate, this is yet to be proven.