Abstract
Kinematic alignment is aphilosophy for individual knee prosthesis implantation in athree-dimensional view. The key of the concept is to understand the femoral flexion-extension axis as the centre of acylinder within the posterior condyles. This axis defines the knee in three dimensions over the entire range of motion. The tibia follows the femur, is balanced on the knee in extension and flexion, and shows individual laxities in flexion and deep flexion. As aconsequence, limbs will be reconstructed along their constitutional leg axis, which in most patients is different to astraight hip-knee-ankle centre axis. The method aims at perfectly reconstructing the natural joint lines, which in many patients leads to the natural oblique joint lines. This results in considerable advantages, as the natural stability of the knee is restored, and native patella kinematics are maintained. From astatic view, polyethylene and the implant-bone interface may be vulnerable to mechanical overloading due to altered adductor moments. However, agrowing body of evidence shows that naturally oriented knee joints show a more balanced loading pattern. Moreover, dynamic gait patterns actually show the mechanism of even reduced knee adductor moments, explaining the clinical results of up to 10years follow up.
Published Version
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