[BIOMECH] - Effect of different femoral deformities in Total knee prosthesis implantations: is custom specific position a good strategy?
Effect of different femoral deformities in Total knee prosthesis implantations:
is custom specific position a good strategy?
Prof. Bernardo Innocenti, PhD
T: 02 650 35 31
Location : UB3 – 169
Email : bernardo [dot] innocenti [at] ulb [dot] ac [dot] be
Context of the project:
Total knee arthroplasty (TKA) is a successful procedure with more than 600,000 surgeries performed in the USA each year. Its implantation, in a well-aligned patient is performed cutting the femur and the tibial orthogonal to the bone mechanical axis (Figure 1).
Furthermore, in the literature, several studies reported that a different implant position induces alteration of bone and implant stress, which may induce both polyethylene overload and/or aseptic loosening due to mechanical failure of the bone-cement-implant interface.
In some patients, leg deformation, in particular of femoral rotation (Figure 2), is present and therefore is quite difficult to define the best implant position in this situation.
For this reason, the aim of this study is to check in different patients having different femoral deformities, the optimal position among the conventional position and a more custom-specific position. In details the study will be focus on the analysis of bone stress and ligament strain together with tibio-femoral and patella-femoral kinematics during daily activities.
The project will be performed numerically with the use of Finite Element Analysis.
Figure 1 Example of a well fixed total knee prosthesis, following the correct mechanical alignment.
Figure 2 Example of internal, normal and external femoral deformities
 Innocenti et al., JOA,31:295-301, 2016