One of the most significant technological advancements in current medicine is the computer-assisted surgery, which, for orthopaedics, one of the major uses of this technology is in knee arthroplasty. The main contribution provided by computer-assisted orthopaedic surgery (CAOS) to knee arthroplasty is its potential to improve prosthesis implant precision and the operated limb alignment, contributing to results optimization and longevity. The image-independent navigation, based on anatomical references acquired during surgical procedure through infrared rays’ transmitters, has been the prevailing technique in knee arthroplasty. We used the navigation system "OrthoPilot" version 2.2 in total knee arthroplasty for inserting 72 knee prosthesis "Search Evolution" by "Aesculap" with or without posterior stabilization in a continuous series. The objective was to measure the accuracy of the alignment achieved with navigation through wide-angled X-ray images obtained postoperatively. We found a mean deviation for the null mechanical axis of 0.66º with standard deviation of 0.7º, with 98.6% of the knees being within an error margin of 3º and 78.2% with error lower than 1º. We concluded that the system is safe and accurate, not causing additional morbidity to conventional surgery.
Knee; Arthroplasty; Replacement; Knee; Knee Prosthesis; Surgery; Computer-Assisted
