The SL-PLUS has evolved from years of highly successful clinical results in Europe and is well optimized.

Immediate Primary Stability

The SL-PLUS is specifically designed for both primary and long-term stability. Numerical approximation was used to generate its unique contour which approximates a taper distally and the femur's anatomy proximally, providing secure axial positioning of the stem. In addition, the rectangular form anchors the stem rotationally. This initial stability allows time for fixation, creating secondary stability and helping ensure long term success.

Rotational Stability

The SL-PLUS's rectangular corners provide a mechanical interlock with the cortical bone. Mathematical modeling (FEA) has shown this design to have significantly reduced micro-motion compared to an idealized canal filling stem design. Micro-motion inhibits fixation, reducing long-term stability.

Maintains Space in Medullary Canal
The SL-PLUS, with its flat sides, does not completely fill the medullary canal. By maintaining this area, the endosteal blood supply is still maintained, increasing long-term prosthesis success by promoting healthy bone.

Trochanteric Wing
Primary stability is critical for a cementless stem system. In addition to the double taper rectangular geometry, the trochanteric wing acts as stabilizing element. It also increases the overall proximal surface area for cementless fixation.

For more information on SL-PLUS ask your local Smith & Nephew Sales rep.