Trabecular Metal Modular Acetabular System
|
The integration of Trabecular Metal TM material and modularity into a proven implant design results in a fusion of technology and versatility that not only meets surgeon demands for initial and long-term stability, but also provides a wide variety of shell and liner options to address specific patient needs. |
|
COEFFICIENT OF FRICTION
Trabecular Metal material possesses a substantially higher coefficient of
friction on 
cancellous bone than other implant materials.
[i] This property facilitates direct bone apposition
[ii],[iii] to
increase initial stability at implantation.
SHEAR STRENGTH COMPARISON
Bone interface shear strength (MPa) of Trabecular Metal material is higher
compared to other fixation surfaces.
[iv],[v]
ELLIPTICAL CUP GEOMETRY
The elliptical shape of the cup creates an interference fit with the
spherically reamed acetabulum. From the pole of the dome, the interference
fit increases until a 2mm differential is achieved at the face of the cup.
This maximizes bone contact and enhances initial stability.
PROVEN LOCKING MECHANISM
Proprietary locking mechanism helps prevent dislocation of the liner from
the shell, yet allows easy disassembly without damaging the liner. Liner
security is complemented by antirotational tabs, and micromotion is
minimized by full congruency between the liner and shell.
[vi]
Combining the clinically successful Trilogy ®Acetabular System design with the proven benefits and ingrowth potential of Trabecular Metal material presents a unique option for total hip arthroplasty. A variety of shell/liner combinations are possible to address a wide range of bone conditions, kinematic needs, and surgeon preferences.
PRIMARY AND REVISION OPTIONS
The benefits of modularity are revealed through the versatility of its shell and liner options. Trabecular Metal shell configurations include Non-holed, Cluster-holed, and Multi-holed. These shells can be used with any of the Trilogy Acetabular Liners.
LONGEVITY CROSSLINKED POLYETHYLENE
In addition to high-performing compression-molded standard polyethylene, acetabular liners are available in Longevity ®Crosslinked Polyethylene.
[i] 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.
[ii] Goldberg VM, Stevenson S, Feighan J, et. al. Biology of grit blasted titanium alloy implants. Clin Orthop. 1995;319:122-129.
[iii] Hacking SA, Bobyn JD, Toh K-K, et al. The osseous response to corundum blasted implant surfaces in a canine total hip arthroplasty model. Clin Orthop. 1999;364:240-253.
[iv] Bobyn JD, Hacking SA, Chan SP, et al. Characterization of new porous tantalum biomaterial for reconstructive orthopaedics. Scientific Exhibition: 66th Annual Meeting of the AmericanAcademy of Orthopaedic Surgeons; 1999; Anaheim, CA.
[v] Bobyn JD, Stackpool G, Toh K-K, et al. Characteristics of bone ingrowth and interface mechanics of a new porous tantalum biomaterial. J Bone Joint Surg. 1999;81-B:907-914.
[vi] Doehring TC, Saigal S, Shanbag AS, Rubash HE. Micromotion of acetabular liners: measurements comparing the effectiveness of locking mechanisms. Orthopaedic Research Society, 42nd Annual Meeting, 1996.
