Abstract
Mechanical axis restoration remains a primary goal of total knee arthroplasty. Incomplete asymmetrical component seating, through intended or unintended alterations in surgical technique, changes the component alignment and, thus, the overall mechanical axis. Using a trigonometric analysis, it was determined that incomplete seating of 1 to 5 mm can alter the coronal alignment by 0.7° to 4.9°, depending on the amount of asymmetry as well as the size of the femoral or tibial component. This analysis quantifies the degree of changes surgeons should expect when incomplete component seating is encountered intraoperatively.
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