There may be persistent infection in the knee joint. Please need to see your xrays and examine for further opinion

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She looks like she is in a difficult situation. Sadly when joint surgery gets infected it can be a terrible ordeal for all involved. Especially at this age it is even harder as the body is very slow to recover. I hope after the revision surgery there isn't any infection remaining and that the implant is stable. She should start walking and her liver and kidney function should be checked coz she is having lots of fluid retention in her body leading to swelling.

Hello Kindly provide details of surgery and investigations for appropriate advice