Introduction: In order to evaluate the accuracy of computer-assisted TKA, precise post-operative measurements of limb alignment are essential. These measurements can be performed using standard radiographs, CT scans, or intraoperative limb alignment data from navigation systems. The purpose of this study is to determine the strength of the association and degree of correlation between measurements taken from standard post-operative radiographs and intraoperative navigation measurements, as well as the degree of consistency by which these measurements are made. In addition, an appreciation of the difference that exists between intended alignment and clinically acceptable alignment as assessed through intraoperative navigation can demonstrate the subtle limitations of a navigation system. This information can ultimately be used to gauge the degree of confidence one should place on standard radiographs as the primary measure of alignment performance in computer-assisted TKA.
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