Alternate postures for someone who cannot bend knees all the way?

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Does anyone have any web sites that give some alternate postures for someone whose knees do not work right?

I fell, and after surgery I have a knee injury that means I cannot bend it more that 90 degrees without extreme, incredible, worse in my life PAIN. My left knee is now developing osteoarthritis, due to doing more to help out the right knee. There are asanas I cannot do at the moment. I need some half poses so I can maybe develop the flexibility again.