Trabecular Metal™ Acetabular Revision System :
Modularity = Flexibility
The Zimmer Trabecular Metal Acetabular Revision System gives surgeons an exceptional array of options to properly address the full range of acetabular defects. The system’s use of modular components enables surgeons to tailor a solution to specific patient needs without requiring the use of custom implants.
The components that make up the Zimmer Trabecular Metal Acetabular Revision System include Trabecular Metal Modular Multihole Shells, Longevity® Highly Crosslinked Polyethylene Modular Liners, Trabecular Metal Revision Shells, Longevity Highly Crosslinked Polyethylene Cemented Revision Liners, Trabecular Metal Augments, Trabecular Metal Restrictors, Trabecular Metal Buttress Augments, Trabecular Metal Shim Augments, and Titanium Cages, which are used to create the Cup-Cage Construct.
Shells and Liners
Trabecular Metal Modular Multi-hole Shells
- To create initial stability, Trabecular Metal Material combines an excellent coefficient of friction against bone and an elliptical shape (5,6)
- Industry-leading locking mechanism—allows liners to be snapped in and removed easily, providing intraoperative flexibility and ease of liner exchange
- Trabecular Metal Material offers long-term fixation via fully interconnected pores (1,2)
Longevity Highly Crosslinked Polyethylene Modular Liners
- 89% reduction in wear, compared to conventional polyethylene liners (7)
- Multiple liner options available, including neutral, 10° elevated, 20° elevated, and 7mm offset in a large range of sizes
- Large head diameters, up to 40mm, for increased joint stability and range of motion
Trabecular Metal Revision Shells
- To create initial stability, Trabecular Metal Material combines an excellent coefficient of friction against bone and an elliptical shape (5,6)
- High strength-to-weight ratio and low modulus of elasticity of Trabecular Metal Material permit physiologic loading and help minimise stress shielding (2,9)
- Designed to allow 2–3mm cement mantle, securing screws and preventing backside wear between components
- 75–80% porosity of Trabecular Metal Material allows excellent cement interdigitation between liner and revision shell
Longevity Highly Crosslinked Polyethylene Cemented Revision Liners
- Reduced wear, compared to conventional polyethylene liners (7)
- 0° neutral and 10° oblique liner options
- Grooved backside decreases stresses in cement mantle and provides rotational stability
- Large head diameters, up to 40mm, for increased joint stability and range of motion
Trabecular Metal Acetabular components provide a biologic reconstructive solution for severe acetabular defects. The shells and augments can be easily customized to fit an individual patient’s anatomy and associated acetabular deficiency. Compared to bulk allografts, the Trabecular Metal Augments require less surgical exposure and alleviate the concerns about graft resorption and disease transmission. - Scott Sporer, MD
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References
1. Bobyn J, Stackpool G, Hacking S, Tanzer M, Krygier J. Characteristics of bone in-growth and interface mechanics of a new porous tantalum biomaterial. J Bone Joint Surg, 1999;81-B(5):907-914.
2. Bobyn J, Hacking S, Krygier J, Chan S, Toh K, Tanzer M. Characterisation of a new porous tantalum biomaterial for reconstructive surgery. Scientific Exhibition: 66th Annual Meeting of the AmericanAcademy of Orthopaedic Surgeons; Feb. 4-8, 1999; Anaheim, CA.
3. Bobyn J, Toh K, Hacking S, Tanzer M, Krygier J. Tissue response to porous tantalum acetabular cups—a canine model. J Arthroplasty, 1999;14(3): 347-354.
4. Shimko D, Shimko V, Sander E, Dickson K, Nauman E. Effect of porosity on the fluid flow characteristics and mechanical properties of tantalum scaffolds. Published online Feb. 2005 in Wiley Interscience (www.interscience.wiley.com).
5. Zhang Y, Ahn P, Fitzpatrick D, Heiner A, Poggie R, Brown T. Interfacial frictional behavior: cancellous bone, cortical bone and a novel porous tantalum biomaterial. Journal of Musculoskeletal Research, 1999;3(4):245-251.
6. Shirazi-Adl A, Dammak M, Paiement G. Experimental determination of friction characteristics at the trabecular bone/porous-coated metal interface in cementless implants. J Biomed Mat Res, 1993;27:167-175.
7. Data on file at Zimmer.
8. Paprosky W, Perona P, Lawrence J. Acetabular defect classification and surgical reconstruction in revision arthroplasty. A 6-year follow-up evaluation. J Arthroplasty, 1994;9:33-44.
9. Krygier J, Boyden J, Poggie R, et al. Mechanical characterisation of a new porous tantalum biomaterial for orthopaedic reconstruction. Proc SIROT. Sydney, Australia, 1999.
10. Lewallen D, Meneghini M, Poggie R, et al. Revision Hip Arthroplasty with Porous Tantalum Augments and Acetabular Shells. Scientific Exhibit (SE03), Annual Meeting of the AmericanAcademy of Orthopaedic Surgeons; March 22-26, 2006; Chicago, IL.
