Design and Technology
SYNERGY◊ Hip System incorporates successful Smith & Nephew design features including unique neck geometry and dual progressive offsets.
- Standard and high offset designs
- Threaded driving platform with an elliptical slot
- Improved neck geometry
- Recommended head/neck ratio
- No unnecessary anteversion
- Optimized 12/14 taper
Superior range of motion
The circulotrapezoidal neck and optimized 12/14 taper designs of SYNERGY stems provide increased range of motion (ROM) compared to other designs.
All of the stems in the SYNERGY system (cemented and cementless) use the same 2 trays of instrumentation. The simple ream-and-broach system provides operating room efficiency: ream to a 14, broach to a 14, implant a 14 stem.
- Locking broach handles
- Few trial necks required
- A variety of trial heads
- Rigid stem inserter
- Easy-to-use anteversion handle
The cementless line of SYNERGY stems is manufactured from a titanium alloy, Ti 6Al-4V
The sintered-bead ROUGHCOAT™ Porous Coating is manufactured from commercially
SYNERGY HA is a press-fit stem with the proximal one-third sprayed with 50 microns of almost 100% pure HA over a grit-blasted surface.
3. Porous Plus HA
SYNERGY Porous Plus HA Cementless Stem uses the same technology as the SYNERGY Porous Stem. HA is applied to the porous coating using the same specifications as the HA stem.
SYNERGY Cemented Stem offers many of the advantages of the cementless system, along with special benefits due to its unique design. SYNERGY Cemented Stem is made of forged cobalt chrome with a satin surface finish. Features of the cemented stem include:
- Cement mantle
- Distal groove stability
- Ramp and collar pressurization
Download the SYNERGY Surgical Techniques
1. Meltzer W, Goldstein W, Skinner H, Tozakoglou E. Time motion study of total hip replacement: a tool to improve surgical team performance. A scientific exhibit at: Annual Meeting of the American Academy of Orthopaedic Surgeons; February 4–7, 1999; Anaheim, CA.
2. Data on file at Smith & Nephew, TM328802.
3. Thornberry R, Lavernia C, Barrack R, Tozakoglou E. The effects of neck geometry and acetabular design on the motion to impingement in total hip replacement. A scientific exhibit at: Annual Meeting of the American Academy of Orthopaedic Surgeons; March 19–22, 1998; New Orleans, LA.
4. Danesh-Clough T, Bourne RB, Rorabeck CH, McCalden R. The mid-term results of a dual offset uncemented stem for total hip arthroplasty. J Arthroplasty. 2007 Feb;22(2):195–203.
5. Bourne RB, Rorabeck CH. Soft tissue balancing: the hip. J Arthroplasty. 2002 Jun;17(4 Suppl 1):17–22.