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Prospective Clinical Advantages of Trabecular Metal(TM) Technology Highlighted in Comparative Study
Date:7/20/2009

so exacerbate patients' osteolytic response to bearing surface particles, potentially further reducing the bony support for the implant. The authors of the study suggest that the elasticity (low stiffness) of Trabecular Metal material may induce a transfer of stresses to the periacetabular bone that more closely replicates the normal physiologic load transfer, thereby decreasing the detrimental effects of stress-shielding by allowing the bone to respond to normal loading patterns. In this study, clinically significant bone preservation and in-growth were observed radiographically around Trabecular Metal implants. These results indicate the potential for improved long term biologic fixation with Trabecular Metal implants and could result in fewer and less complex revision procedures.

"Few studies draw firm conclusions about the performance of cementless components in implants used in total hip arthroplasty, and for the most part, data about bone remodeling after surgery has been limited to short-term follow-up," said David Lewallen, MD, orthopaedic surgeon at the Mayo Clinic and one of the study's authors. "Our findings confirmed initial assumptions that the low stiffness properties of this porous metal --similar to cancellous bone--were better able to transfer physiological stresses, theoretically decreasing the detrimental effects of stress-shielding commonly seen around traditional acetabular implants."

Trabecular Metal material is a structural biomaterial whose cellular architecture resembles bone and approximates its physical and structural properties more closely than other prosthetic materials. The unique, highly porous trabecular configuration is conducive to more normal bone formation and bone in-growth, decreased stress-shielding, and the potential for improved long term implant fixation. Trabecular Metal implants are fabricated using elemental tantalum metal a
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SOURCE Zimmer Holdings, Inc.
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