Trabecular Metal™ Revision Shell

Initial and Long-Term Stability

  • Fully-interconnected trabecular structure with two to three times the porosity of other cups enables extensive tissue ingrowth and strong attachment.1,2
  • High coefficient of friction3,4 against bone provides great scratch-fit and initial stability.
  • Low stiffness of Trabecular Metal material can produce more normal physiological loading and reduce stress shielding.5  
  • One-piece construct, created by cementing the liner, eliminates concerns about backside wear.
  • Elliptical geometry creates a 2mm interference fit at the periphery of the shell, maximizing bone contact for initial and long-term stability.6  

Versatile Fixation and Positioning

  • Shell is designed for use in revision and primary cases. 
  • Shell is placed in best position for maximum host bone contact, while 0° neutral and 10° oblique liners allow for preferred version.
  • Dome screw holes allow for additional fixation into structural bone.
  • Longevity® Highly Crosslinked Polyethylene liners in various configurations available to best meet patient need.

Trabecular Metal material not only looks like bone, but it also has physical and mechanical properties similar to bone. Its high compressive strength and low modulus of elasticity are comparable to cancellous bone.1,3 These features are what make Trabecular Metal Material - The Best Thing Next to Bone.™

References

  1. Bobyn JD, Hacking SA, Chan SP, et al. Characterization of a new porous tantalum biomaterial for reconstructive orthopaedics. Scientific Exhibit, Proc of AAOS, Anaheim, CA. 1999.
  2. JD Bobyn, GJ Stackpool, SA Hacking, M Tanzer, JJ Krygier, “Characteristics of Bone In-Growth and Interface Mechanics of a New Porous Tantalum Biomaterial”, The Journal of Bone and Joint Surgery (British Version), Sept, 1999, 81-B No. 5 pp 907-914.
  3. Zhang Y, Ahn PB, Fitzpatrick DC, Heiner AD, Poggie RA, Brown, TD, “Interfacial frictional behavior: Cancellous bone, cortical bone, and a novel porous tantalum biomaterial”, Journal of Musculoskeletal Research, 3(4): 245-251, 1999.
  4. A Shirazi-Adl, M Dammak, G Paiement, “Experimental determination of friction characteristics at the Trabecular bone / porous-coated metal interface in Cementless implants”, the J of Biomedical Research, Vol 27, 1993, pp 167-175.
  5. Pedersen DR, Brown TD, Poggie RA. Finite element analysis of periarticular stress of cemented, metal-backed, and porous tantalum backed acetabular components. 45th Annual Orthopaedic Research Society Meeting, Anaheim, CA. 1999.
  6. Sculco TP: The Acetabular component: an elliptical monoblock alternative. J Arthroplasty 17, No. 4, Suppl. 1:118, 2002.

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