[Axisless knee endoprosthesis in patients with chronic polyarthritis]

Axial-free knee prostheses have proved their worth in the treatment of arthritic knees. Normal axial alignment and physiological ligamentous guidance can be accomplished by this type of prosthesis, even in cases of severe deformity and instability. In addition, unconstrained prostheses show some important advantages in comparison to constrained prostheses.