Concept/Description - smith&nephew RT-PLUS Surgical Technique

Concept/Description

The RT-PLUS™ Modular is a constrained rotating knee prosthesis for cemented implantation.
The prosthesis allows an internal/external rotation of approx. 10° each. This is locked by the
tibial-insert when extended. Due to the peg design, the prosthesis has the capability
of elongation, i.e., for distraction between the femoral and the tibial components. In an ext-
reme fl exed position, the femoral component can lift off the tibial-insert, which reduces
the sagittal leverage forces that have an effect on the prosthesis stem in this load situation.
The implant allows sparing resections. The cut compatibility with the tricompartmental pros-
thesis TC-PLUS™ permits if necessary an intraoperative switchover from the resurfacing to
the constrained rotating knee.
The femoral and tibial components of RT-PLUS Modular are identical to those of RT-PLUS,
with the exception of the additional option to connect stems and augmentation blocks. The
tibial inserts are the same. As a result, the femoral and tibial components in both these
systems are entirely cross-compatible. All the stems of RT-PLUS Modular can be combined
with the femoral and tibial components of RT-PLUS Modular to suit requirements.
The implants are available in fi ve sizes (corresponding to RT-PLUS sizes 2, 4, 6, 8 and 10).
Apart from size 2, the sizes can be combined with the next size up or down.
Note
RT-PLUS Modular requires condylar support for the femoral/tibial components. The forces
have to be absorbed by the condyles as well as by the stems.
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