System Features
The TMARS system consists of the following acetabular and auxiliary implant designs:
Trabecular Metal Revision Shells and Liners
Designed for use in revision and primary cases. A one-piece construct, created by cementing the liner into the shell, eliminates concerns about backside wear. The low modulus of elasticity of the Trabecular Metal material can produce more normal physiological loading and reduce stress shielding.
Trabecular Metal Cup Cage
Used in conjunction with the Trabecular Metal Revision Shell to provide adequate stability by spanning acetabular defects and pelvic discontinuities to provide initial mechanical stability of the Cup-Cage construct until biological fixation occurs. Cementing the Longevity Highly Crosslinked Polyethylene Liners, Cages, and Trabecular Metal Revision Shells together creates a single construct, without concerns of micromotion.
Trabecular Metal Buttress and Shims
- Work with the revision shell to address extensive superior segmental defects (Paprosky Type IIIA).
- Serves as an alternative to allograft, without potential for bone resorption or disease transmission.
- Creates a monolithic construct without concerns for micromotion by using cemented interfaces.
- Conserves host bone while implant size, position, and orientation are determined by the defect.
Trabecular Metal Augments and Restrictors
The Trabecular Metal Acetabular Augments and Restrictors fill bone deficiencies as an alternative to preparing and using structural grafts.
Specifications
Up to 80% porosity
With 100% open, interconnected pore structure, designed to support bony in-growth and vascularization
Augments, Cages and Shells
- Shims placed between the buttress augment flange and host bone optimize the fit of the device against iliac bone conserving host bone and providing structural support.
- Cages can be contoured to fit the acetabulum while providing mechanical stability.
- Restrictors and augments come in many sizes supporting coverage of defects.
- Revision shells feature multiple hole options to support the system
Benefits
Proven
Proven technology and fixation
Addresses Range of Deformities
Designed to fit Paprosky Type I to IV acetabular deformities, enabling an algorithmic approach to challenging revisions.
Lower Infection Rates
Trabecular Metal (TM) acetabular components used in revision THA are associated with decreased rates of re-revision for infection compared to non-TM components as reported by Tokarski et al.
