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Cementless Femoral Hip System

SL-PLUS Femoral Hip System

Product Information

Features and Benefits

  • 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 Family 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
Orthopaedic Clinic
Vienna - Gersthof



Clinical Evidence Summary

Clinical Evidence

SL-PLUS Clinical Evidence

With over half a million implantations world-wide, the Zwyemüller philosophy of implants has proven to have predictable and reproducible results.

  • 99% stem survivorship over 15 years1
  • 99% over 10 years2
  • 100% over 10 years3


1. Grübl A, Chiari C, Gruber M, Kaider A, Gottsauner-Wolf F. Cementless total hip arthroplasty with a tapered, rectangular titanium stem and a threaded cup: a minimum ten-year follow-up. J Bone Joint Surg Am. 2002 Mar; 84-A(3):425-431.
2. Delaunay C, Kapandji AI. Survival analysis of cementless grit-blasted titanium total hip arthroplasties. J Bone Joint Surg Br. 2001 Apr; 83(3):408-413.
3. Garcia-Cimbrelo E, Cruz-Pardos A, Madero R, Ortega-Andreu M. Total hip arthroplasty with use of the cementless Zweymüller Alloclassic system. A ten to thirteen-year follow-up study. J Bone Joint Surg Am. 2003 Feb; 85-A(2):296-303.

Design and Technology

SL-PLUS Design and Technology

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.


SL-PLUS Indications

SL-PLUS Stem is intended for advanced hip joint wear due to degenerative, post-traumatic or rheumatoid arthritis, fracture or avascular necrosis of the femoral head.

The SL-PLUS Stems are for uncemented use only. The devices are intended to aid the surgeon in relieving the patient of hip pain and restoring hip motion.

Download the SL-PLUS Family Surgical Technique


SL-PLUS Frequently Asked Questions

What sizes does the SL-PLUS stem come in?
Standard 14 sizes: 01-12
Lateral 12 sizes: 1-12

What is the taper for the SL-PLUS stem?

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This information is intended for health care professionals in the United States only.

Caution: US Federal law restricts the sale of these devices to or on the order of a physician.