I need to lose some weight before my knee surgery....

But I have no motivation!

The weight gain that I have already is from my first knee surgery (car accident = broken kneecap) I was unable to do any cardio, hell i couldnt even walk. So I gained 30 pounds. But now I can walk and do low impact cardio (with pain from the screws, surgery is to get them removed) so I would like to lose about 10-15 pounds before then. I have about a month before surgery. I just dont want to be unable to walk again and add more weight.

Inspirational words or anything that has a bit of motivation will help a sister out!! THank you!