Designed for in-growthEach parameter of the Tesera structure—from pore size and shape to surface roughness—was designed based on decades of research on bone in-growth.
Proven biocompatibilityMade from gold-standard titanium alloy, Tesera Trabecular Technology porous structure demonstrated excellent bone in-growth in a weight-bearing animal study.
Strength and bone-like modulus.The Tesera structure matches the modulus of elasticity of cancellous bone, while the solid portion is 100% dense titanium alloy.
Secure fixationThe large pore size of the Tesera structure results in surface prominences that grip into bone for initial stability, while bone in-growth provides long-term security.
Advanced materials for enhanced device performance
Renovis is committed to providing innovative products that help surgeons meet demanding patient needs. By combining advanced materials, like the Tesera Trabecular Technology porous structure, with tried-and-true design principals, Renovis aims to enhance device performance and longevity. Tesera Trabecular Technology implants provide:
- The initial stability required for early fixation
- The strength required for weight-bearing,
- A scaffold for bone in-growth and long-term fixation
Tesera Trabecular Technology porous structure is highly porous, with an average pore diameter of about 500 μm.Pores of this size can accommodate bone in-growth and the vascularization required to sustain living bone.[8-11]
Designed for bone in-growth
Each parameter of the Tesera Trabecular Technology porous structure—from pore size and shape to surface roughness—was design based on decades of published research on bone in-growth surfaces.
|Parameter||Published Guidelines||Tesera Trabecular Technology||Meets / Exceeds Requirements|
|Material Composition||Ti-alloy “gold standard” [1,2]||Ti-alloy|
|Pore Volume||55-60%; higher is better [5,12,13]||64±6.2 |
|Surface Micro-Roughness||Approximate grit-blasted (0.45-7.0μm) [6,7]||Yes|
|Average Pore Diameter||100-500μm; in upper range for vascularization [8-11]||504 |
|Pore Shape||Rugged, irregular ||Yes|
Roughened titanium alloy has been used clinically for more than 35 years and remains the gold standard for bone on-growth.[1,2] A study of bone in-growth into Tesera Trabecular Technology bone plugs was conducted in a sheep femur model.[16,26] The results revealed:
- No implant-associated adverse effects on the host bone
- Excellent new bone formation
- Bone remodeling within and adjacent to the porous structure
Light microscope images showing excellent bone ingrowth by the 12 week time point and continued bone growth at 24 weeks.
Strength and bone-like modulus for long-term success
The Tesera porous structure is not a coating; the solid and porous portions are built up in one continuous process. This process produces 100% dense titanium alloy, with properties like wrought material.
The modulus of the Tesera porous structure falls within the range of values reported for cancellous bone.
Initial stability for secure fixation
The large pore size of the Tesera porous structure provides initial mechanical stability as the surface prominences grip into the bone; the mechanical interlock of bone growing into the structure provides long-term fixation.
In laboratory testing of the Tesera structure on cancellous bone, the coefficient of friction was substantially improved over plasma-strayed coating and better than a contemporary highly porous tantalum structure.[18-20] A higher frictional coefficient enhances initial stability and promotes ingrowth by limiting micromotion at the bone-to-implant interface.[21,22]
Tesera Trabecular Technology
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Tesera Trabecular Technology
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- Kieswetter K, et al. The role of implant surface characteristics in the healing of bone. Crit Rev Oral Biol Med. 1996; 7(4):329-345.
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- Data on file with Renovis Surgical. SEM Evaluation. Test Report K13047307-1.
- Data on file with Renovis Surgical. Coating Evaluation per ASTM F1854-09. Test Report K12076592-4.
- Surgeries were performed at IMDS Discovery Research (Logan, Utah); processing and analysis of the specimens was conducted by the Bone and Joint Research Laboratory (Salt Lake City, Utah). Data on file with Renovis Surgical.
- Willie BM, Bloebaum RD, Bireley WR, Bachus KN, Hofmann AA. Determining relevance of a weight-bearing ovine model for bone ingrowth assessment. J Biomed Mater Res A. 2004 Jun;69(3):567-76.
- Data on file with Renovis Surgical. Coefficient of Friction ASTM G115-10. Test Report K13047307-4.
- 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 Mater Res. 1993;27(2):167–75.
- 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. 1999;3(4):245-251.
- Dammak M, Shirazi-Adl A, Schwartz M Jr, Gustavson L. Friction properties at the bone–metal interface: comparison of four different porous metal surfaces. J Biomed Mater Res. 1997 Jun; 35(3):329–336.
- Biemond JE, Aquarius R, Verdonschot N, Buma P. Frictional and bone ingrowth properties of engineered surface topographies produced by electron beam technology. Arch Orthop Trauma Surg. 2011 May;131(5):711-8.
- Hiemenz J. EBM offers a new alternative for producing titanium parts and prototypes. Time-Compression Technologies. 2006 May/June: 16-20.
- Jasty M, Bragdon C, Burke D, O’Connor D, Lowenstein J, Harris W. In vivo skeletal responses to porous-surfaced implants subjected to small induced motions. JBJS Am. 1997 May;79(5):707-14.
- Data on file with Renovis Surgical. Tensile/Compression Tests. Test report K13047307-5.
- Willie BM, Bloebaum RD, Bireley WR, Bachus KN, Hofmann AA. Determining relevance of a weight-bearing ovine model for bone ingrowth assessment. J Biomed Mater Res A. 2004 Jun 1;69(3):567-76.
*Trabecular Metal is a trademark of Zimmer, Inc. (Warsaw, Indiana).
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