Design features of an individual thrust plate prosthesis

The purpose of the present study was to document the osteotomy plane for th e thrust plate prosthesis, and to evaluate the question whether the geometr y of the thrust plate itself? correlates with the range of motion after imp lantation and whether the osteointegration area can be optimised. For the first part of the study, the two-dimensional geometry of the osteot omy was demonstrated in 12 computer-reconstructed femurs after performing a virtual cut at a CCD angle of 135 degrees. In the second part we construct ed a prototype of an I-TPP with an optimised thrust plate and corpus geomet ry. In a final step, we documented the range of motion with computer-aided movement mapping. The results showed a wide Variance in osteotomy geometry in the 12 femurs. With the I-TAP we were able to obtain a much better surface adaptation of t he thrust plate. Movement mapping showed a much lower range of motion in th e I-TPP implant.