A Stress Analysis of the Proximal Tibia after Insertion of the Endprosthesis

Detailed investigation for the local stress increment at the fixation post bottom of an artificial knee joint was performed by two-dimensional finite element method. A strain measurement was also conducted by wire strain gauges on a cancellous bone with a special method. It was made clear that a curvature with a certain extent of radius was necessary for the corner of a fixation post and application of acrylic cement with a certain extent of thickness (3 mm≥) was effective for stress relaxation, and that an optimum value (10-110 GPa) existed for elastic modulus of bone cement.