I have arthritis in my knees. I am 63 years old. 3 months ago, after playing basketball (I know, but I beat my son in law and grandson...and I am an obese woman) my left knee became so painful I couldn t put any weight on it. I had to crawl up the steps to bed. Next day, I went to er, had to get wheelchair. xray showed arthritis and high kneecap. Rx was aleve and painpills. It has gotten somewhat better, but right knee is very painful now also though n ot as bad as the left was. I am living on ibuprofin, taking 400mg every 8 hours. what could this be?