This will be a one time,I hope to help someone?
bare with me.
I had a sore knee for months I saw a doctor who xrayed and found nothing out of order. I did not twist it and I do not run. It began hurting around jan. 2007. For some reason it hurt more when I got out of bed?
This is what it came down too.
My wife is always freezing cold, so she piles on the blankets at night.
and the sheets are tucked in very tight, I sleep on my back.
So "imagine" on your back with your feet down at the end and the heavy blankets plus the tight sheets forcing your feet and toes down pulling strain on the knee muscle area I don't know the medical terms but try it and you will get the idea. I now ware heavy socks and let my feet stick out or just the loose sheet on my toes. pain is gone.
I walk and carry my golf clubs for nine holes twice a week. Feels great.
I hope this might help at least one person a sore knee is a killer.
Been there.