J. Jerosch et al., Virtual simulation for optimizing the range of motion in hip alloarthroplasty using an adapted trust-plate prosthesis model, ORTHOPADE, 29(7), 2000, pp. 605-613
The purpose of the present study was to increase the free range of motion i
n conventional trust-plate prosthesis design and to optimize the trust-plat
e contact as well as the osteointegration area below the trust-plate.
For the first part of the study, the two-dimensional geometry of the osteot
omy plane was demonstrated in 25 CT-reconstructed femora after performing a
virtual cut at a CCD angle of 135 degrees. In the second part, we construc
ted a prototype of an anatomic adapted trust-plate prosthesis (A-TPP) with
an optimized trust-plate and corpus geometry based on the three-dimensional
data of three human cadaveric femurs (age 67-75 years). In the final step,
we documented the range of motion with computer-aided movement-mapping and
compared the conventional TPP with the A-TPP.
The results showed a wide variance in osteotomy geometry in the 12 femurs.
With the A-TPP, we were able to obtain a much better fit in the trust plate
surface. The movement-mapping showed a much higher range of motion in the
A-TPP implant. With the A-TPP, the implant surface area for osteointegratio
n could also be significantly increased.