Modular Replacement System (MRS) Cemented Stems, Sterile, Catalog Numbers: 6485-3-000, 6485-3-008, 6485-3-009, 6485-3-010, 6485-3-018, 6485-3-019, 6485-3-300, 6485-3-308, 6485-3-309, 6485-3-310, 6485-3-318, and 6485-3-319. || The Modular Replacement System has been successfully used in clinical in clinical situations where there is extensive bone loss due to tumor resection, and/or failed previous prosthesis, or trauma. These components can be used to replace the proximal femur, the distal femur, the proximal tibia, or to reconstruct the total femur in extreme clinical situations.