ConforMIS customisable total knee replacement system wins FDA clearance

21 Feb 2011

US company ConforMIS has received US FDA clearance to market its iTotal CR knee-replacement system, a patient-specific system for patients who would traditionally receive a standard total knee replacement (TKR).

The iTotal CR builds on ConforMIS’ patented iFit technology for generating patient-specific implants and individualized jigs.

As with all ConforMIS implants, the system uses computer modeling to build a 3D image of a patient’s knee from CT scans. That image then guides the proprietary design and manufacture of not just the jigs, but the personalized implants that resurface the patients’ articular surfaces.

The patient-specific process produces customized implants with unparalleled advantages. Each iTotal CR is made to fit an individual patient precisely without the under-sizing and overhang common with standard systems. The ability to maximize coverage for each patient is combined with one of the broadest implant contact areas in the industry, resulting in extremely low polyethylene contact stress.

A ConforMIS femur design simulation
Individualized implant surface generation during design of an
iTotal CR femoral component (photo: Business Wire).

In addition, the iTotal CR is engineered to do more than just greatly improve fit. Patient specific technology on the femur preserves significantly more bone than a traditional total knee replacement. The design software generates medial and lateral articulating surface geometries for each patient that more closely mimic a patient’s natural geometry while correcting for deformity.

“The ability to give patients a long lasting, natural feeling knee has been the holy grail of orthopaedics for decades,” said Wolfgang Fitz, MD, a member of the surgeon design team. “A patient-specific total knee that reconstructs the surface geometry of the condyles has the potential to create a knee replacement that is as close to normal as it gets.”

“The iTotal 510(k) clearance marks a new phase in ConforMIS’ leadership of the patient-specific category by expanding our product line to address the full range of opportunities in the multi-billion dollar knee market, the largest segment in orthopedics,” said Philipp Lang, MD, CEO of ConforMIS. “In introducing the only true patient-specific total knee system, we are creating opportunities for innovation that will dramatically change the way patients and surgeons approach orthopedics.”

The iTotal system will be available in limited release to a select group of surgeons in 2011.


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