- Zweymüller Stem
- Square, dual taper with rectangular cross-section
- Immediate Stability
- Made from Bio-compatible Titanium Alloy
- 14 standard sizes
Our collaboration with Professor K. Zweymüller, who has decades of experience with cementless hip prostheses, has produced the square, dual taper SL-PLUS® stem. Together with the intuitive instrumentation, the SL-PLUS represents a system that is accommodating and forgiving. The SL-PLUS provides unsurpassed primary stability, along with a tailor made surface, to support long-term survivorship.
Initial stability is critical for a cementless prosthesis. The SL-PLUS, with its dual taper rectangular design, achieves initial stability in two ways. The dual taper locks into a secure axial position, while the rectangular form anchors the stem rotationally. Once initial stability has been achieved, the materials used and the surface architecture promotes secondary stability. The SL-PLUS is forged from highly biocompatible titanium alloy. This material more closely matches the elasticity of bone to reduce stress shielding. Then, it is grit blasted to produce a surface structure to promote secondary stability.
The SL-PLUS stem is a strong option. All surgical instrumentation is intuitive and extremely flexible, reducing surgical time and complications. Also, the femoral canal is compaction broached not reamed, therefore, bone is not removed but impacted into the periprosthetic region which creates an active bone bed for new bone formation.
The SL-PLUS system offers 14 standard stem sizes from 128-188 mm in stem length, and 12 lateral stems sizes from 136-188mm in stem length.
Download the SL-PLUS Surgical Technique
Message from Dr. Zweymüller
"My cementless stem system which consists of a tapered straight stem with a rectangular cross-section was implanted for the first time in 1979. Based on the follow-up of cases, gradual improvements were made, culminating in the development of the SL stem in 1986. This new system covered a large majority of indications, and the results were much better than those achieved with the original implant.
The current SL-PLUS® straight stem integrates the constructional features which have shown to promote extensive, long-section bony anchorage. However, changes have been made at the proximal end of the implant in order to optimize the intraoperative handling of the implant and to increase primary anchorage by improving the proximal transmission of forces.
The positive long-term clinical results reinforce our faith in this stem concept and encourage us to continue improving it, based on the experience gained."
Vienna, December 1996
Prof. Dr. med. K. Zweymüller
Vienna - Gersthof