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.