PROMOTIONAL FEATURE
The purpose of this study by H Lanternier and C Schwartz is to analyse the FHK prosthesis developed by Group FH ORTHO for total knee replacement
Group FH ORTHO has great experience in the design, manufacture and distribution of TKA: firstly, in the 1990s with Thémis; then in 1999 developing Academia; and in 2009 the third-generation knee prosthesis, FHK, which is the subject of this study.
General implant considerations
The femoral component and tibial tray are manufactured in CoCr for its cemented version and CoCr coated with Ti40 and HAP for the uncemented version, available in seven sizes.
The FHK is available in Cruciate retaining, Posterior Stabilized and Mobile Bearing versions [1] (see Figure 1).
Figure 1: FHK mobile bearing (left) and FHK posterior stabilised (right).
It is possible to add extension stems to the tibial tray; this is recommended in cases with poor bone quality (see Figure 2).
Figure 2: FHK mobile bearing with an additional tibial stem.
Patellar resurfacing can be done with a conventional inlay polyethylene (PE) dome implant, or with an inlay PE implant.
The tibial polyethylene is snapped on to the periphery on the tibial base in the fixed plateau version or snapped onto a central post in the mobile version.
Some original points merit further explanation:
The trochlear tracking is shifted backwards by deepening the groove. This is done by use of a trochlear chisel through the femoral cutting block. This means that patellar stress is reduced and flexion is facilitated. Furthermore, medio-lateral design has been reduced to avoid impingement onto the soft tissues.
The radius of curvature i