
Computer-assisted navigation systems or orthopedic navigation systems incorporate intra-operative execution and pre-operative planning information by demonstrating three-dimensional computer images in relative patient anatomy that is image-guided surgery systems. These image-guided surgery systems consist of a computer workstation with surgical planning and image-processing software, a display monitor, and a digitization system. Computer software allows the surgeon to measure angles, volumes, and distances and to zoom and rotate. This helps in determining the cutting planes and implant positioning. Orthopedic navigation systems are used in surgeries for knee, hip, spine, joint, and shoulder replacement. Total knee arthroplasty, revision of total knee arthroplasty, kinematic evaluation, and uni-compartmental arthroplasty are the applications wherein these navigation systems can be used. In case of hip surgeries, these systems can be used in total hip arthroplasty. In spine surgeries, orthopedic navigation systems can be used to treat defects caused by degenerative disc diseases, spinal stenosis, fractures, and spondylolisthesis.