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I read your query and understand your concern.
There is no need to worry about the foot as it can be due to a soft tissue injury, and you can continue with the medications and apply the ice pack for the same. However, I would suggest wearing knee braces full time and trying to walk if possible. Once the swelling is gone completely, the doctor will check for abnormality; if there is cause for concern, then we need to treat accordingly, and if not, the swelling will subside within three to four days. Also, kindly revert with the MRI scanning report.