My Oxford Partial Knee did great until it failed. The mechanics within the wedge or partial replacement failed in 8 months. After several weeks of beginning to click, my knee became swollen and I could no longer walk with out a cane or help. The surgeon has scheduled a full knee replacement. Anyone have a Sigma Rotating Platform Knee, which is what is planned? I am metro NYC. My sister-in-law is getting a Zimmer knee replacement in Chicago.