A biomechanical study about different handle shaped tibial prosthesis inserted in different implant angle in the TKA / 中国医师杂志

ABSTRACT

Objective To explore mechanics condition in artificial knee joint replacement tibial prosthesis with different shaft body shapes implanted into tibia in different inclination angle,and discuss which shaft shape in tibial prosthesis is suitable in different inserted angle.Methods Finite element model of tib-ial prosthesis with cylindrical handle,square taper shank,columns taper shank,ladder airfoil cross wing shape with column wing handle were built and assembled with bone cement and polymer polyethylene pad.The finite element software ANSYS15.0 was used to analyze the variation of stress and strain of all kinds of body shape handle prosthesis in tilting to 0° and 3°,6°under the working condition of the existing literature data.Results Different stress and strain changes were observed in the finite element models of tibial prosthesis with different shaft shapes in tilting to 0°,3°,and 6°.Conclusions For the different tibial prostheses of 6 kinds of shaft shapes,when placed in tilting to 3°,prosthesis with cylindrical taper shank and column wing were suitable to be chosen; and when placed at 0°,prosthesis with ladder airfoil handle should be avoided to use,because of stress concentration easily could lead to a fractured in bone cement; Placed in the lean 6° level,prosthesis with cylindrical,square taper shank,cylindrical handle taper shank and column wing handle were suitable to be chosen.