Hi.. 5 yrs post infected total knee replacement (TKR) with implant removed almost 4 yrs ago. initial treatment would be debridement (cleaning of the joint), later resection arthroplasty(removal of the implant and apposing the bony ends) or a arthrodesis( implant removed and fusion of the joint) The prognosis differently comes down with every subsequent surgery. In your scenario-. 1) see for features of infection- symptoms/signs like - fever, knee joint swelling, painful knee , unable to bear weight, unable to bend knee, local rise of temperature, severe tenderness, CRP - Elevated, Synovial fluid culture sensitivy- positive for mcro-organism growth. if such is present then joint bebridement ( arthrotomy)+ cement removal + arthrodesis is the best option, provided your same hip and ankle are normal. 2) if no infection- x-ray shows good bony quality and good anatomical orientation then revision TKR can be a option but chances of failure rate are high. 3) If no infection but instabilty of knee present then surgery ( arthrodesis) is the option. i would suggest arthrodesis as a good option for u advantage being- painless, functional joint, can walk without aid(walker, stick, others support) minimal chance of infection. but disadvantage being- unable to bend the knee ( since its fused). SO visit a joint surgery specialist for further management.