The P.F.C.® Sigma® TC3 design is the most constrained device available within the P.F.C.® Sigma® Knee System and is indicated for use in cases where collateral ligaments are deficient. This comprehensive system offers both a fixed-bearing and rotating platform option. Additionally surgeons are able to address bone and soft tissue defects with a variety of options, like augments, stems and metaphyseal sleeves. This system's approach to revision knee surgery provides the surgeon with maximum intraoperative flexibility.