Navigation-Assisted Total Knee Arthroplasty for Patients with Extra-Articular Deformity

situations likes stress fractures, previous surgical interventions, metabolic bone disease can also be possible reasons5,6). Altered mechanical axis of the lower limb and anatomic landmarks inter-fere with correct implantation of TKA components, and this can be a reason of malalignment that can lead to patellar maltracking, early loosening, higher rates of polyethylene wear1-5,7). Retained hardware and canal sclerosis, which are frequently seen in pa-tients with extra-articular deformity, can also be an obstacle in TKA. Under such abnormal situations, usage of conventional in-strumentations of TKA including intramedullary femoral guide and intra- and extramedullary tibial guide is highly restricted. TKA in knees with extra-articular deformity can be done through staged or one-stage operation. The lower incidences of anesthesia, operation and complication are the relative advan-tages of one-stage operation over staged operation. Surgical navi-gation system can be a good option that facilitates simultaneous treatment of osteoarthritis and extra-articular deformity of the knee. The purpose of this study was to report good clinical and radiological results of navigation-assisted TKA for osteoarthritic knees with extra-articular deformity